noun
( plural men friday or men fridays )
Usage: often capitalized M & usually capitalized F
Etymology: after Friday, native servant of Robinson Crusoe, hero of the novel Robinson Crusoe (1719), by Daniel Defoe died 1731 English journalist and novelist
: a valued aide or employee who gives efficient and devoted service and is usually entrusted with a wide range of tasks : right-hand man
the man Friday of the party leader is seldom a capable successor — K.R.Popper