SANTA CLAUS

[noun] [not after the], [informal] Santa [noun] [U not after the] - the imaginary old man with long white hair and a beard and a red coat who is believed by children to bring them presents at Christmas, or a person who dresses as this character for childrenGo to sleep quickly or Santa Claus won't come!(UK) Santa's grotto is a place where children can receive presents from a person dressed as Santa.They're having a Santa's grotto at the school fair.Most of the big stores have a Santa's grotto in the weeks before Christmas.