くび よこ
kubio yokoni furu

Godan Verb (ru)
Expression

1. to shake one's head (in disagreement); to disagree; to refuse; to say no; to turn down (a request)

Related to 首を縦に振る
なんらかの理由 りゆう彼女 かのじょ くび よこ った。
nanrakano riyūde kanojowa kubio yokoni futta.
For some reason or another she shook her head.