noun
high card
In poker and other card games, a hand with no pair or better, ranked by the highest card. Also used more generally for the highest-ranking card in a suit or hand.
ポーカーでハイカードしかないときは、エースが強い。
In poker, when you only have a high card, an ace is strong.
この勝負はハイカードで決まる。
This match will be decided by the high card.