Etymology

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Today it means: To close (remove a gap) completely or fully. Full definition →

Middle English upclosen
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The story

  1. Middle English · derived fromupclosen“to close up, stop up, seal”
  2. English todayclose up

Dissimilated from Middle English upclosen (“to close up, stop up, seal”).

Etymology from Wiktionary, CC BY-SA 4.0.