Simplified form of 飲. Pictograph of a person with an open mouth (欠) drinking from a wine vessel (酉). 欠 also represents the sound. The 酉 (wine) component and the open mouth was later reanalyzed as 饣 (eat).
Components
饣(iconic) — 饣 is a component form of 食. Used here to depict an open mouth drinking from a wine vessel (酉). Later reanalyzed as 饣 (eat).
欠(sound, iconic) — Depicts a person bending over with their mouth open.