Meaning of the word "when the chips are down" in English

What does "when the chips are down" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

when the chips are down

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

Idiom

when a situation is difficult or serious

Example:
You'll see who your true friends are when the chips are down.
He always performs best when the chips are down.