yellow card
US /ˈjel.oʊ ˌkɑːrd/
UK /ˈjel.oʊ ˌkɑːrd/

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.