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 飠 (eat).
Shuowen Jiezi
《說文》：“，歠也。从欠，酓聲。”
Components
飠(iconic) — 飠 is a component form of 食. Used here to depict an open mouth drinking from a wine vessel (酉). Later reanalyzed as 飠 (eat).
欠(sound, iconic) — Depicts a person bending over with their mouth open.