The Proto-Indo-European word *swerbʰ-
Word *swerbʰ-
Meaning to turn, to move in a twirling motion
Synonyms *kʷel-, *(s)kerbʰ-, *(w)rep-, *ter(i)-

Comments
Mallory J.P. and Adams D. (2006)

Other words that might be of interest
*ank-2, ang- ‘to bend, bow, curve, snake coil, anchor’, *gēu-, gǝu-, gū- ‘to bend, curl, a kind of vessel’, *ĝʰwel- ‘to bend’, *leng- ‘to bend’, *lenk- ‘to divide, to bend, to traverse’