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Definition of aback:

  1. An abacus.
  2. Backward against the mast; - said of the sails when pressed by the wind.
  3. Behind; in the rear.
  4. Toward the back or rear; backward.

Synonyms:

unexpectedly, suddenly, short, by surprise, prepared, unawarely, unanticipatedly, unaware, unawares.

Usage examples: