Jul 4, 2018 · The expression "I'm in" or "count me in" mean that you wish to be included in a proposed activity. For example: "I'm going to the bar. Anyone else coming?" "Count me in!" I believe the …

The phrase "Who's in?" does exist in very informal English, at least in American English. It is equivalent to saying "Who wants to participate in X with me?" It is not used very often, at least in my experience. …

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