to not include sb in an activity; to count things one after the other as you put them somewhere
count sb out
to not include sb in an activity
If you're going out tonight you'll have to count me out.
count sb / sth out
to count things one after the other as you put them somewhere
She counted out $70 in $10 bills.
Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición