Proto-IE: *pArp- / *perp-
Meaning: to swell
Old Greek: hellenist. pérpero-s m. `eitler Windbeutel, Geck, Prahler', pérpero- `eitel, prahlerisch', perperéu̯omai̯ `windbeuteln, prahlen'
Russ. meaning: надуваться
References: WP II 50 (different in Pok. 810-816).