首を横に振る， くびをよこにふる
1. to shake one's head (in disagreement), to disagree, to refuse, to say no, to turn down (a request)
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友人は「不可能だ」と言わんばかりに首を横に振った。
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My friend shook his head as much as to say "impossible".
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首を横に振ることで不承認を与える。
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They communicate disapproval by shaking their heads.
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私は彼女に本当のことを言うようにいったが、彼女は首を横に振った。
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I told her to tell me the truth, but she shook her head.
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何らかの理由で彼女は首を横に振った。
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For some reason or another she shook her head.
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