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top dog

noun

Definition of top dog

  1. :  a person, group, or thing in a position of authority especially through victory in a hard-fought competition

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First Known Use of top dog

1900

TOP DOG Defined for English Language Learners

top dog

noun

Definition of top dog for English Language Learners

  • : a person or group that has the most power or success

Learn More about top dog

  1. See words that rhyme with top dog

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