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adverb

la main sur le cœur

/la mɛ̃ syʁ lə kœʁ/

adverb/la mɛ̃ syʁ lə kœʁ/

in all sincerity, open-heartedly, with hand on heart

mentir la main sur le cœurto lie brazenly, shamelessly

Putting one's hand on one's heart when talking is seen as a gesture of sincerity.

la main sur le cœur — French Dictionary | Passage