bum - definition of bum by the Free Online Dictionary, Thesaurus and Encyclopedia.

bum 1 (bŭm) n. 1. A tramp; a vagrant. 2. A lazy or shiftless person, especially one who seeks to live solely by the support of others. 3. An incompetent, insignificant, or obnoxious person: The batter called the pitcher a bum. 4. One who is devoted to a p

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