snicker

窃笑、暗笑、偷笑多含嘲讽意

Some students snickered when he mispronounced the word.

他把那个字念错时，有些学生在偷笑。

嘲笑、讥笑常与 at 连用

They snickered at her old-fashioned clothes behind her back.

他们在背后嘲笑她过时的衣著。

窃笑、窃笑声

A snicker went around the room before the teacher turned back.

老师转身之前，教室里传出一阵窃笑。