This
database is a comprehensive collection of all the American idioms and slang available.
American Idioms are many and varied. We hope you enjoy our collection. We are adding more all the time.
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To be poor, to have difficulty supporting yourself.
Most people who marry young start out living hand to mouth. During the Great Depression and other times of economic scarcity, people often did not know when or where the next meal was coming from. In such a case, when you get something in your hand that can be eaten, it goes into the mouth immediately: ergo "hand to mouth."