The classical phrase "to bolt the door" uses this character.
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扃 is not used on its own in modern Chinese. It is a literary word for the wooden bar that bolts a door shut, built from the door radical 户 plus the phonetic 冋. You meet it only in classical texts and set phrases about closing doors.
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Archaic and literary only — it appears in old prose and etymology notes, never in everyday speech, where 门 and 关门 are used instead.
户 is the single-leaf door radical. It anchors the meaning here: 扃 is the bar that fastens a door, so the door element carries the sense while the rest supplies the sound.
