To close (remove a gap) completely or fully.
Some flowers close up at night to stay protected from the cold.
To move nearer together so that a gap is removed.
The crowd closed up and I couldn't get through to the train.
To shut a building or a business for a period of time.
We finally managed to close up the shop for the night at about 10 o'clock.
Dissimilated from Middle English upclosen (“to close up, stop up, seal”).
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