Meaning of くぎをさす in Japanese
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Definition of くぎをさす
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(exp, v5s) to give a warning; to remind (a person) of
実際はそんなことあるわけないが、釘を刺すにはちょうどよさそうだ。
There's no way something like that would really happen, but it seemed just right to drive the point home.