проболтался

let slip, blabbed

p r ə b ɐ ɫ t a ɫ s ⁽ʲ ⁾ ə → проболтаться

про through, across; to completion + болта to chat, to talk + л Masculine past tense + ся Reflexive marker

verb · singular masculine, past tense Rare #35,508

let slip, blabbed Usually means accidentally revealing something that was meant to be kept secret.

RU: Он случайно проболтался о сюрпризе.

EN: He accidentally let the surprise slip.

Did you spill the beans?

Who let it slip?

— Жизнь не может быть скучной! (2011)

Tom was going to lie, but ended up letting the cat out of the bag.

He let the cat out of the bag.

— Дзета (2026)

Who spilled the beans?!

— Преследователь (2008)

I almost let it slip.