Definition of count (someone) in
: to plan to include (someone) in an activity : to consider (someone) as one of the people who will be doing something
"Do you want to go to the beach with us?" "Yes! Count me in!"
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Great Words for Scrabble
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- Which of the following Q-without-U words means the number five in cards or dice?

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Merriam-Webster unabridged
Share count (someone) in