へそを曲げる (へそをまげる) Japanese meaning | KotomoraMeanings
1
expression, ichidan verb
sulk; get cranky; get cross; become perverse
idiomatic expression
Idiomatic expression meaning to become sulky, stubborn, or uncooperative, often over something trivial. Literally 'to bend one's navel'.
妹はおもちゃを取られてへそを曲げている。
My little sister is sulking because her toy was taken away.