Definition of who's who in English:

who's who

noun

  • A list or directory of facts about notable people.

    • ‘This is a comprehensive who's who, a list of the members of the club.’
    • ‘The company's client list reads like a who's who of the Irish corporate world.’
    • ‘The list of private helicopter owners reads like a who's who of the country's richest businessmen.’
    • ‘The list of invited guests read like a who's who of the sport's hallowed history.’
    • ‘The daunting list of victors reads like a who's who of golf.’

Pronunciation:

who's who

/ˌhuːz ˈhuː/