A who’s who of something
“A who’s who” of something is a list of important people in a particular area.
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“A who’s who” of something is a list of important people in a particular area. On Saturday, Buckingham Palace threw a Platinum Jubilee concert and party in her honor, where “a who’s who of celebrities,” or a list of important celebrities, came to pay tribute to her seven decades on the throne. The invitation list reads like “a who’s who” of the theater world.