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            800-pound gorilla        
        
                    
                
                    
                
            
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        one that is dominating or uncontrollable because of great size or power 
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            bull in a china shop        
        
                    
                
                    
                
            
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        a person who breaks things or who often makes mistakes or causes damage in situations that require careful thinking or behavior 
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            busy bee        
        
                    
                
                    
                
            
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        one who is very busy and active 
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            can of worms        
        
                    
                
                    
                
            
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        a prolific source of troubles 
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            cat and mouse        
        
                    
                
                    
                
            
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        a contrived action involving constant pursuit, near captures, and repeated escapes 
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            cats and dogs        
        
                    
                
                    
                
            
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        in great quantities : very hard 
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            clam up        
        
                    
                
                    
                
            
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        to become silent 
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            cold turkey        
        
                    
                
                    
                
            
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        the act of stopping a bad habit (such as taking drugs) in a sudden and complete way 
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            dog days        
        
                    
                
                    
                
            
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        the hottest time of the year 
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            elephant in the room        
        
                    
                
                    
                
            
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        an obvious major problem or issue that people avoid discussing or acknowledging 
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            fish in the sea        
        
                    
                
                    
                
            
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        used to say that there are many more people available for a romantic relationship 
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            have a cow        
        
                    
                
                    
                
            
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        to become very angry, upset, etc. 
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            lion's share        
        
                    
                
                    
                
            
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        the largest portion 
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            look a gift horse in the mouth        
        
                    
                
                    
                
            
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        to look in a critical way at something that has been given to one 
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            monkey around        
        
                    
                
                    
                
            
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        to do things that are not useful or serious : to waste time 
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            one-trick pony        
        
                    
                
                    
                
            
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        one that is skilled in only one area 
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            pig out        
        
                    
                
                    
                
            
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        to eat greedily : GORGE 
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            rabbit hole        
        
                    
                
                    
                
            
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        a complexly bizarre or difficult state or situation conceived of as a hole into which one falls or descends 
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            scaredy-cat        
        
                    
                
                    
                
            
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        an unduly fearful person 
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            sitting duck        
        
                    
                
                    
                
            
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        an easy or defenseless target 
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            the cat's meow        
        
                    
                
                    
                
            
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        used to say that someone or something is very appealing 
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            the straw that breaks/broke the camel's back        
        
                    
                
                    
                
            
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        the last in a series of bad things that happen to make someone very upset, angry, etc. 
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            the world is someone's oyster        
        
                    
                
                    
                
            
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        used to say that someone's life is good and he or she has the ability to do whatever he or she wants to do 
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            weasel out of        
        
                    
                
                    
                
            
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        to avoid doing (something) by being dishonest, by persuading someone in a clever way, etc. 
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            when pigs fly        
        
                    
                
                    
                
            
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        used to say that one thinks that something will never happen 
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            wild goose chase        
        
                    
                
                    
                
            
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        a difficult and long search for something that is not important or that cannot be found 
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            wouldn't hurt a fly        
        
                    
                
                    
                
            
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        to be too gentle to want to hurt anyone 
Love words? Need even more definitions?
  
  Merriam-Webster unabridged



