sending off       
noun [ C ] UK uk/ˌsen.dɪŋˈɒf/ us/ˌsen.dɪŋˈɑːf/
 (体育比赛中,某人)被罚下场
an occasion when a sports player is ordered to leave the playing area during a game because they have done something wrong
  The sending off of Voight enraged the crowd. 把沃特罚下场激怒了观众。 
 a sending-off offence 可被罚下场的犯规行为