expression, godan verb (-su)
stick out one's tongue
Physical action of protruding the tongue, often as a childish gesture, to show embarrassment, or playfully.
子供が恥ずかしそうに舌を出した。
The child stuck out their tongue shyly.
写真を撮るとき、彼はよく舌を出す。
He often sticks out his tongue when taking photos.
expression, godan verb (-su)
ridicule behind one's back; laugh at someone secretly
Idiomatic use: making fun of someone when they are not present, often with a sense of sneering or contempt.
陰で舌を出すようなことはやめなさい。
Stop ridiculing people behind their backs.