shiver: Shiver ‘tremble’ [13] and shiver ‘sliver, fragment’ [12] are different words. The former was originally chiver, which may have been an alteration of an earlier chevel ‘shiver’. This in turn was derived from the Old English noun ceaft ‘jaw’ (source of English jowl), and so etymologically denoted the ‘chattering of the teeth’. Shiver ‘fragment’ may have been borrowed from Low German (Middle Low German had schever). It goes back ultimately to the prehistoric Germanic base *skif- ‘split’. => jowl[shiver etymology, shiver origin, 英语词源]