He sniggered quietly to himself.
Schoolchildren snigger at the mention of some words.
It is no good sniggering or sneering at them.
It is no use him sitting there and sniggering.
During their three-week trial, they sat sniggering in the dock.
I thought that they were sniggering at each other, which is perhaps appropriate.
I do not know at what he is sniggering.
