to utter a sound

• 他从来不吭声。

  He's never uttered a word.

• 他没有吭声就走了出去。

  He just left without saying a word.

• 他受了很多气，可是从来不吭声。

  He's been bullied a lot but he's never complained.

• 他一声也不敢吭。

  He didn't dare utter a word.

• 他硬是不吭声。

  He simply kept silent.