Etymology 1

probably of origins, related to various words having to do with inflation or puckering: Danish , Dialectal Swedish , Frisian , Low German , Old English
From Indo-European root beu having a meaning associated with the notion "to swell".

Noun

1. One's facial expression when pouting.
   • 2008, Vladimir Nabokov, Natasha, written 1924, translated by Dmitri Nabokov

     With a pout, Natasha counted the drops, and her eyelashes kept time.

2. A fit of sulking or sullenness.

Verb

1. To push out one's lips.
2. To be or pretend to be ill-tempered; to sulk.
3. To say while pouting.

Etymology 2

From as in , from Indo-European root beu having a meaning associated with the notion "to swell".

Noun

1. Shortened name of various fishes such as the hornpout (Ameiurus nebulosus, the brown bullhead), the pouting (Trisopterus luscus) and the eelpouts (Zoarcidae).