a jocular term that alludes to the variety of persons and roles present in a particular organization, generally used by way of introduction, as in “Before we dive in let me tell you who’s who in the zoo”; implies some level of organizational or situational complexity, and that the hearer will subsequently be familiarized with a group of individuals; the subtext of this phrase can include sharing who has authority for various decisions, who must be dealt with deferentially, or who must be satisfied for the overall effort to be successful
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