Webster's Revised Unabridged Dictionary · 1913

Quaff

Quaff , transitive verb

[For quach, from Gael. & Ir. cuach a drinking cup; compare Latin caucus a drinking vessel. Compare Quaigh.]

To drink with relish; to drink copiously of; to swallow in large draughts.
Quaffed off the muscadel. — Shakespeare
They eat, they drink, and in communion sweet Quaff immortality and joy. — Milton

Quaff , intransitive verb

To drink largely or luxuriously.
Twelve days the gods their solemn revels keep, And quaff with blameless Ethiops in the deep. — Dryden