snicker

US /ˈsnɪk.ɚ/
UK /ˈsnɪk.ɚ/
1.

cười khúc khích

to laugh at someone or something in a silly and often unkind way:

:
What are you snickering at/about?
1.

cười khúc khích

the act of laughing at someone or something in a silly and often unkind way:

:
She barely stifled a snicker.