yellow card

US /ˈjel.oʊ ˌkɑːrd/
UK /ˈjel.oʊ ˌkɑːrd/
"yellow card" picture
1.

cartão amarelo

a card shown by the referee to a player who has committed a foul, indicating a caution

:
The referee gave him a yellow card for a reckless tackle.
O árbitro deu-lhe um cartão amarelo por uma entrada imprudente.
He received two yellow cards and was sent off the field.
Ele recebeu dois cartões amarelos e foi expulso do campo.