shyster shy·ster [shahy-ster] Show IPA noun Informal. 1. a lawyer who uses unprofessional or questionable methods. 2. a person who gets along by petty, sharp practices. Origin: 1835–45, Americanism; probably < German Scheisser, equivalent to scheiss ( en ) to shit + -er -er1 ; final -ser conformed to -ster
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