On-þringan
Bosworth & Toller Anglo-Saxon Old English Dictionary - on-þringan
According to the Old English Dictionary:
(?) :-- Beofode ðæt eálond foldweng onþrong [onsprong
- on-þringan
- the earth cracked with the shaking (?)], Exon. Th. 181, 28; Gú. 1300. on-þringan