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Related to count in: Count Me In
count someone in (for something)and count someone in (on something);count someone in
to include someone as part of something. Please count me in for the party. Do count me in on it. Count in everybody who said they would attend.
count something in
to include something in a count of something. Did you count the tall ones in? Did you count in the tall ones in the corner?
Include, as in Can all the members be counted in? or I'd love to come; count me in. [Mid-1800s]