from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Exhibiting great detail: a blow-by-blow description of the accident.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Detailing every action or occurrence completely.
  • n. An account, description, or commentary including every detail of the action or event.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. providing great detail


Probably from the detailed description of a fight or boxing match, where a "blow" means a hit or a landed punch. (Wiktionary)



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