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Greg stammered during his speech and his workmates sniggered cruelly.

Two students kept on sniggering at their teacher throughout the lesson.

asked Harry, while Ron sniggered

It's not very friendly to snarl or snigger at someone - make sure you SMILE instead!

An example of snigger is to secretly laugh at someone behind their back.

Go on, snigger.

Why are you sniggering, you idiot?