count offTo recite numbers in turn, as when dividing people or things into groups
[TahlilGaran] Dictionary of Contemporary English ▲
count off v. 1. To count aloud from one end of a line of men to the other, each man counting in turn.
The soldiers counted off from right to left. 2. To place into a separate group or groups by counting.
The coach counted off three boys to carry in the equipment. Tom counted off enough newspapers for his route. [TahlilGaran] English Idioms Dictionary ▲