expression, ichidan verb
pout; purse one's lips
Describes the action of pushing one's lips forward in a pout, often to show displeasure or sulkiness. The expression is a set phrase using the causative form of 尖る.
See also: 口を尖らす (くちをとがらす)
彼女は不満そうに口を尖らせた。
She pouted her lips in dissatisfaction.
The child is pouting after being scolded.