Noun has 1 sense

• heart-to-heart(n = noun.communication) - an intimate talk in private; "he took me aside for a little heart-to-heart"

Derived form adjective heart-to-heart₁

Adjective has 1 sense

• heart-to-heart(s = adj.all) candid, open - openly straightforward and direct without reserve or secretiveness; "a heart-to-heart talk"; "an open and trusting nature"; "his candid eyes"

Derived form noun heart-to-heart₁