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noun tin·horn \ˈtin-ˌhȯrn\

Simple Definition of tinhorn

  • : a person who talks and acts like someone who is strong and powerful but who is really weak, unimportant, etc.

Source: Merriam-Webster's Learner's Dictionary

Full Definition of tinhorn

  1. :  one (as a gambler) who pretends to have money, ability, or influence

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