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verb

tomber sur un os

/tɔ̃.be syʁ œ̃.n‿ɔs/

verb/tɔ̃.be syʁ œ̃.n‿ɔs/

to hit a snag, to find a fly in the ointment

Synonyms: tomber sur un bec

Literally, “to come across a bone”.