Proto-Tungus-Manchu: *čib-
Meaning: to wriggle, roll
Russian meaning: извиваться, кататься
Evenki: čiwar-
Comments: ТМС 2, 389. Cf. also Evk. čepče- 'to roll; to plait (a string, rope)'. An expressive and isolated root, therefore the PTM reconstruction is dubious.