Literally, “to lie like one breathes”, i.e. naturally.
- IPA(key): /mɑ̃.tiʁ kɔm ɔ̃ ʁɛs.piʁ/
mentir comme on respire
- (simile, informal) to lie constantly, to be a born liar
- The pronoun on agrees with the subject of mentir: tu mens comme tu respires, il ment comme il respire, etc.