Am-byre

According to the Old English Dictionary:

(am- = and-).

am-byre

Substitute: Unfavourable, contrary (of wind) :-- Þyder, hé cwæð, þæt man ne mihte geseglian on ánum n, mónðe, gyf man . . . ǽlce dæge hæfde ambyrne wind, Ors. l, I ; Bos. 21, 20. [Cf. Icel. aud-viðri a head wind. Mod. Icel. and-byrr (= mðt-byrr). (Dr. Craigie's note.) am-byre