釘を刺す

釘を刺す (くぎをさす) means to warn someone firmly in advance.

Kana

くぎをさす

Meaning

to warn someone firmly in advance

Japanese Example

遅刻しないように釘を刺しておいた。

Translation

I made sure to warn him in advance not to be late.

Related idioms

みみにはさむ

to happen to hear something

目から鱗が落ちる

めからうろこがおちる

to have one’s eyes opened

くちがおもい

to be reserved and not talkative

to have trouble dealing with something