IdiomDaily LifeJapanese

釘を刺す (kugi o sasu)

Meaning: To remind someone firmly so they can't back out.

Literally: To drive in a nail

Example: “遅刻しないように、上司は前もって釘を刺した。” — The boss warned us firmly in advance not to be late.

Origin: Driving in a nail secures a joint so it cannot slip. Kugi o sasu is warning someone or reminding them firmly so they cannot back out or forget. Its origin is usually linked to carpentry, but no particular story lies behind it.

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