Óþ-spurnan

According to the Old English Dictionary:

-spornan

óþ-spurnan

to strike against, stumble :-- Hió óþsper[n]þ impingetur, Kent. Gl. 769. Ðé læs ðín fót óþsporne, Blickl. Homl. 27, 14. Næs gecweden ðæt his fót æt stáne óþspurne, 29, 3-- Cf. æt-spurnan. oþ-spurnan