yellow card
Pronunciation:
/ˈjɛl.əʊ ˌkɑːd//ˈjɛl.oʊ ˌkɑɹd/noun
Definitions
A yellow-coloured card, shown to a player (especially in association football) as a caution that he has committed a flagrant foul; a further such foul would result in a red card.
A card sent out by a travelling dance or theatre company to request temporary personnel from a local labor union.
A yellow ticket.