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口を開いた

began to speak

→ 口
phrase Rare #34,275
began to speak Literally means “opened one’s mouth” and is often used to describe someone starting to speak.
JA: 彼はしばらく黙っていたが、やっと口を開いた。
EN: He had been silent for a while, but finally began to speak.

やがて一等航海士が口を開いた。

At last, the first mate spoke up.

そしてついに口を開いた。

And finally, he spoke.

「どうして……」と私は口を開いた。

“Why…” I began.