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verb

être au bout de son latin

/ɛtʁ o bu d(ə) sɔ̃ la.tɛ̃/

verb/ɛtʁ o bu d(ə) sɔ̃ la.tɛ̃/

to be at one's wits' end, to be at the end of one's mental resources

Literally, “to be at the end of one's Latin”, i.e. to have exhausted one's knowledge. Compare German mit seinem Latein am Ende sein.