noun: an unexpected help, benefit, or advantage
Via Latin and Greek from Hebrew man (manna). In the Bible manna was the food supplied to the Israelites by the heavens during their wandering in the desert. Earliest documented use: mid 5th century.
Usage (from Wordsmith)
“The people, also, must accept this new mantra and not expect manna to fall from the tables of their representatives in the government.”
Are Nigerians Ready for the Real ‘Change’?; The Sun (Lagos, Nigeria); Apr 22, 2015.