Etymology

back-

Today it means: Back in its adverbial senses. Full definition →

Middle English bak-
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The story

  1. Middle English · inherited frombak-
  2. English todayback-

From Middle English bak-, bac-, apheretic form of abak, aback (“aback”, adverb). See also aback.

Etymology from Wiktionary, CC BY-SA 4.0.