|"We must've been through hundreds of books already and we can't find him anywhere —"|
To hold a drink.
A goblet, also known as a chalice is a cup used to hold a liquid, usually a drink. They were used to hold drinks at the Welcoming feasts at Hogwarts School of Witchcraft and Wizardry, as well as at the Wedding of William Weasley and Fleur Delacour. Remus Lupin owned some goblets, and let the guests of Shell Cottage use them when celebrating the birth of Ted Lupin.
The Black family earned some silver goblets kept at 12 Grimmauld Place, embossed with their family crest. During the summer holidays of 1995, Mundungus Fletcher examined these and asked Sirius Black if they were solid silver. He disgustedly agreed that they were, 15th-century goblin-wrought silver that was embossed with the Black family crest. In late 1996, Harry Potter discovered Mundungus Fletcher in Hogsmeade with some of these goblets, which he had stolen.