/ məˈstɑːʃ; NAmE / ( BrE ) ( NAmE mus·tache / ˈmʌstæʃ; məˈstæʃ/) noun
1.
a line of hair that a man allows to grow on his upper lip
2.
moustaches [ pl. ] a very long moustache
—compare beard
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WORD ORIGIN
late 16th cent.: from French , from Italian mostaccio , from Greek mustax , mustak- .