PIE base ‘to bend, turn’. See also trep- ‘to turn’, root of Greek trepo ‘to turn’, which gives holotropic, changing the Whole towards Wholeness.
Other derivatives include exchange, interchange; canteen, decant; hump; and Cambridge.
[Pokorny, (s)kamb-, and (s)kemb- ‘to bend, curve, hump’, p. 918, related to *kamb- ‘to bend, curve’, p. 525, root of gambol, via Greek.]