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to be shut; to close; to be closed
to be firm (of a body, face, etc.); to be well-knit
to be locked
to tighten; to be tightened
to become sober; to become tense
ドアが風で緊まった。
The door closed from the wind.
このふたはきつく緊まっている。
This lid is tightly shut.
窓がしっかり緊まっているか出かける前に確認した。
I checked whether the windows were properly closed before going out.