snicker

竊笑、暗笑、偷笑多含嘲諷意

Some students snickered when he mispronounced the word.

他把那個字唸錯時，有些學生在偷笑。

嘲笑、譏笑常與 at 連用

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

他們在背後嘲笑她過時的衣著。

竊笑、竊笑聲

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

老師轉身之前，教室裡傳出一陣竊笑。