Dictionary.com
definitions

red card

noun
  1. Soccer. a red card shown by the referee to a player being sent off the field for a flagrant violation.
Compare yellow card.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for red card

red card

noun
  1. a card of a red colour displayed by a referee to indicate that a player has been sent off
verb red-card
  1. (tr) to send off (a player)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012