On-swífan

According to the Old English Dictionary:

on-swífan

I. to swing, turn:--Bordrand onswáf wið ðam gryregieste Geáta dryhten Beowulf turned his shield against the approaching fire-drake, Beo. Th. 5112; B. 2559. II. to turn aside, divert:--Ne mæg mon ǽfre ðý éð ǽnne his cræftes beniman, ðe mon oncerran mæg sunnan onswífan and ðisne swiftne rodor of his rihtryne, Met. 10, 40. on-swifan