He gave a blow-by-blow account of the entire trip.
A blow-by-blow account of an event describes every stage of it in great detail. She wanted a blow-by-blow account of what happened. a blow-by-blow account/description etc an account that includes all the details of an event exactly as they happened
[ 'blO-bI-'blO, -b&- ] (adjective.) 1933. Probably from the detailed description of a fight or boxing match, where a "blow" means a hit or a landed punch.