I clapped a hand over her mouth.

我猛地用一只手捂住了她的嘴。

《柯林斯英汉双解大词典》

He gazed at her a moment and then passed his hand quickly over his eyes.

他盯着她看了一会儿，然后迅速用手遮住眼睛。

youdao

She put her hand over her mouth to stop herself from screaming.

她用手捂住嘴，以免叫出声来。

《牛津词典》

I could see that the word w-a-t-e-r meant something wonderful and cool that flowed over her hand.

VOA: special.2009.11.08

The Lady in Black looked at it. She remembered the wave of anger that had come over her when she had reached out her hand and silenced the clock that night three months before.

VOA: special.2010.05.15

With her back to me and one hand over her eyes, she handed me some paper underwear.

BBC: Forms of identification: The editor of JohnnyJet

The few occasions I saw her pause she would put a hand over her eyes, breathe in and out deeply, and that was when I would know she was exhausted.

NEWYORKER: The Pura Principle

But when he went to kiss her she screamed and Tabak claimed he held his hand over her mouth and around her neck in an attempt to silence her.

BBC: Vincent Tabak found guilty of Jo Yeates murder