Usage Note
Flancher is informal and means to give up or weaken under pressure; a stronger synonym is céder. You might say ne flanchez pas ! ('don't cave!'). The word may derive from flanc (flank, side), suggesting a weakening of one's defences. It is a regular -er verb.
Examples
"Elle n'a pas flanché sous la pression."
Natural Translation
She didn't flinch under the pressure.
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