Proto-IE: *gnabh-
Meaning: to squeeze, to bend
Old Greek: gnáptō, va. á-gnapto- `Tuch walken, Wolle krempeln; zerreissen, zerfleischen'; gnápsi- `das Walken', gnáptōr m. `Walker', gnáphallo-n n. `Wopllflocken, Kissen'
Slavic: *gnǭbītī `drücken etc.'
Russ. meaning: сжимать, сгибать
References: WP I 580 f (somewhat different in Pok.)