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English definition of “count sb in”

count sb in

informal
verb uk phrasal verb with count   /kaʊnt/ us  
C2 to include someone in an activity or arrangement: "Do you want to come swimming tomorrow?" "Yes, count me in."Taking part and getting involvedGetting involved for one's own benefit or against others' will
(Definition of count sb in from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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