NOUN: Slang One who poses as a satisfied customer or an enthusiastic gambler to dupe bystanders into participating in a swindle. VERB: Inflected forms: shilled, shill·ing, shills INTRANSITIVE VERB: To act as a shill. TRANSITIVE VERB: 1. To act as a shill for (a deceitful enterprise). 2. To lure (a person) into a swindle. ETYMOLOGY: Perhaps short for shillaber.