open one's mouth

idiom

Definition of open one's mouth

: to speak He says something stupid every time he opens his mouth.

Learn More about open one's mouth

Share open one's mouth

Statistics for open one's mouth

Look-up Popularity

Comments on open one's mouth

What made you want to look up open one's mouth? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a flaw that causes the downfall of a hero

Get Word of the Day daily email!

Test Your Vocabulary

A Green Quiz

  • shamrock
  • What is the best definition of green-eyed monster?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!