Definition of man Friday in US English:

man Friday

noun

  • A male helper or follower.

    • ‘Jennifer Hart is a writer and not-so-typical housewife, since most of the actual housework is performed by the couple's man Friday, Max.’
    • ‘I gave my man Friday one of my guns to carry.’
    second in command, second, number two, subordinate, junior, auxiliary, adjutant, lieutenant, subaltern, assistant, personal assistant, pa, aide, helper, right-hand man, henchman, underling
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Origin

From Friday, a character in Defoe's novel Robinson Crusoe (1719), whom Crusoe often refers to as ‘my man Friday’.

Pronunciation

man Friday

/mæn ˈfraɪˌdeɪ/