Etymology

dup

D2U1P3

Today it means: to open (a door, gate etc.) Full definition →

Middle English don up
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The story

  1. Middle English · derived fromdon up“to open”
  2. English todaydup

From Middle English don up (“to open”), equivalent to a blend of do + up. Compare don, doff, dout, dub.

Words from the same roots

Middle Englishdon up all →

dub

Etymology from Wiktionary, CC BY-SA 4.0.