snigger

窃笑、偷笑、暗自讪笑英式

The students sniggered when the teacher mispronounced the word.

老师把那个字念错时，学生们都在窃笑。

窃笑、暗笑、讪笑英式

A snigger went around the room at his awkward answer.

他回答得很尴尬，房间里响起一阵窃笑。