sombrero UK /səmˈbɹɛɹ.əʊ/US /səmˈbɹɛɹ.oʊ/ noun4 •A kind of hat with a high conical or cylindrical crown and a saucer-shaped brim, highly embroidered, made of plush felt.Beatrice looked up and saw a man standing before her; the huge sombrero overshadowed his face, but the light of the lamp shone on a large and glittering knife in his girdle. — 1831 •A mixed drink with coffee liqueur and cream. •A series of four consecutive strikes. •(no longer used) An umbrella. formssombreroes · sombreros