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Etymology 1
Deadjectival, from. Newly-formed and not to be confused with the inherited combining perfective stem, which differs in stress as well as meaning. The latter stem also exists as an archaic stand-alone imperfective meaning “to cause to swell, fill with”.

Verb

 * 1) to cause one to look fatter than one is
 * 2) to cause one to gain weight
 * 1) to cause one to gain weight

Etymology 2
Directly or via from. . Cognate to 🇨🇬, 🇨🇬 and parallel forms in most other Slavic languages.

Verb

 * 1)  to cause to swell, fill with, occupy, enrich
 * Но мы́сль об ско́ром свида́нии одна́ то́лько тепе́рь по́лнит мою́ ду́шу.
 * But the thought of seeing each other so soon now alone swells my soul.
 * Гоголь, Письмо М. И. Гоголь, 14 мая 1826