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A yellow-colored card shown by a referee to a player, especially in soccer, to indicate that the player has committed a flagrant foul. Being shown two yellow cards results in ejection from the game.
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.
(General Sporting Terms) a card of a yellow colour displayed by a referee to indicate that a player has been officially cautioned for some offence
(General Sporting Terms) (tr) to caution (a player) officially for some offence
serving as a warning; intended to warn: a yellow card system is in place.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Soccer. a yellow card shown by the referee to a player being cautioned for a violation. Compare red card.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Displayed by the referee to a player guilty of a serious foul or persistent lesser fouling; constitutes a caution.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited