when the chips are down
在最困难的时刻或最关键的时候
口语·形容困境考验
英文释义
when a situation becomes difficult or challenging; when one is facing adversity or a crisis
例句
When the chips are down, you can always count on your best friend.
典故来源
源自扑克牌游戏,筹码堆叠表示赌注已下,比喻危机时刻。