On-warian

According to the Old English Dictionary:

on-warian

to take heed, beware :-- Is ús tó behealdanne, þæt wé onwarigan þæt þǽra yfela and þǽra unríhta ne sý tó feala, Verc. Först. 105, 4. Is mycel þearf ǽghwylcum men tó onwariganne þæt hé þis symle hæbbe on gemyndum, 109, 10. on-warian