A heart-to-heart is a conversation between two people, especially close friends, in which they talk freely about their feelings or personal problems. I've had a heart-to-heart with him. a conversation in which two people say honestly and sincerely what they really feel about something
[ 'härt ] (noun.) before 12th century. Middle English hert, from Old English heorte; akin to Old High German herza heart, Latin cord-, cor, Greek kardia.