Blow-by-blow

Origin

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

Full definition of blow-by-blow

Adjective

1. (idiomatic) Detailing every action or occurrence completely.He gave a blow-by-blow account of the entire trip.

Noun

1. (idiomatic) An account, description, or commentary including every detail of the action or event.The media published a blow-by-blow of the trial as it happened.