首を横に振る
1
asentir con la cabeza
1
to shake one's head (in disagreement);to disagree;to refuse;to say no;to turn down (a request)
See also:
首を縦に振る (くびをたてにふる)
何らかの理由で彼女は首を横に振った。
For some reason or another she shook her head.