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言っちゃった

said (it), blurted it out

→ 言う
言っ say, tell + ちゃっ Completive (often regretful or accidental) + た Past tense
verb · past indicative Rare #33,158
said (it), blurted it out A casual contraction of 言ってしまった, often suggesting regret or that something was said unintentionally.
JA: 秘密を言っちゃった。
EN: I blurted out the secret.
Conjugation of 言う

誰かがさ、彼に言っちゃったのよ。

Someone went and told him.

ごめん、なにか悪いこと言っちゃったかな。

Sorry, did I say something wrong?

（金井泉）今のうちに知ってること全部言っちゃったほうがいいよ

(Izumi Kanai) You should tell them everything you know while you still can.

— バトル・ロワイアル (2000)

なんでそんなこと言っちゃったの？

Why did you say something like that?

なんでそんなバカなこと言っちゃったの？

Why did you say something so stupid?