when the chips are down
US /wɛn ðə tʃɪps ɑr daʊn/
UK /wɛn ðə tʃɪps ɑr daʊn/

1.
當情況危急時, 在關鍵時刻
when a situation is difficult or serious
:
•
You'll see who your true friends are when the chips are down.
當情況危急時,你就會知道誰是你的真朋友。
•
He always performs best when the chips are down.
在關鍵時刻,他總是表現得最好。