What idiom is snickering?

Smile with your mouth closed: cover: cover. Cover your mouth when you laugh, so as not to be rude.

Cover your mouth, gourd: gourd: smile. Laugh while covering your mouth, snicker, snicker.

Cover your mouth: smile while covering your mouth.

Self-satisfaction: describes the appearance of self-satisfaction.

Enjoy yourself: you can have fun from it.

Self-satisfied: Ming: It means that you think. Think oneself great and show pride.