take somebody into one's confidence
confide in somebody
【形式ばった表現】 disclose [reveal, confide] 《a secret to somebody》
【形式ばった表現】 make a confidant [confidante(女)] of somebody
心を打ち明ける
open [【形式ばった表現】 unburden] one's heart 《to》
let somebody in on 《one's deepest secrets》
何もかも打ち明ける
読み方 うちあける
To confide, disclose, divulge, reveal (a secret to one); to unbosom oneself of, unburden one's heart of, disburden one's heart of (a secret); to confess, make a clean breast of (a guilt); to lay open, lay bare (a scheme to one); to open (one's heart or mind); to let (one) into (the secret); to admit (a person) into one's confidence