shill (sh?l) Slang n.1. One who poses as a satisfied customer or an enthusiastic gambler to dupe bystanders into participating in a swindle.2. One who publicly promotes another’s cause, especially in an extravagant or misleading way.v. shilled, shill·ing, shills v.intr. To act as a shill.v.tr.1. To act as a shill for (a deceitful enterprise).2. To lure (a person) into a swindle.[Perhaps short for shillaber, shill, of unknown origin.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.shill (??l) nslang a confidence trickster’s assistant, esp a person who poses as an ordinary customer, gambler, etc, in order to entice others to participate[C20: perhaps shortened from shillaber a circus barker, of unknown origin]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014shill (??l) n. 1. a person who poses as a customer in order to decoy others into participating, as at a gambling house. 2. a person whose praises, endorsements, etc., are motivated by self-interest. v.i. 3. to work as a shill: to shill for a large casino. [1920?25] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.