Scelfan

According to the Old English Dictionary:

scelfan

p. scealf, pl. sculfon To shake, quiver, totter :-- On ðyssum stapelum sceall ǽlc cynestól standan mid rihte on cristenre þeóde, and áwácie heora ǽnig, sóna se stól scylfþ ... áwácie se cristendóm, sóna scylfþ se cynedóm, L. I. P. 4; Th. ii. 308, 1-7: Wulfst. 267, 18. Ne hrisil scelfaeð, Txts. 151, 7. [Icel. skjálfa; p. skalf to shiver, shake, quiver.] scelfan