count (someone or something) in

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count (someone or something) in

To include someone or something in something, especially as participants are being recruited. Often used as an imperative. Of course I want to go to the amusement park with you guys—count me in! Did you count Cathy in? She said that she'll make something for the potluck as well. Count this old tray in with the other things to be sold at the yard sale.
See also: count