Cost

According to the Old English Dictionary:

es;

cost

m. Condition, mode:--Getíðode hé ðæs . . . ðæs costes ðe (on condition that) heó ðis gelǽste, Cht. Th. 540, 34. Ǽnigum coste ullo modo, Rtl. 113, 34. Unásæccendlicum costum ineffabilibus modis, 108, 27. Þár þegen áge twégen costas, lufe oþþe lage, and hé lufe geceóse where a thane has two ways of settlement open to him, by amicable agreement or by appeal to law, and he choose the former, Ll. Th. i. 298, 5. [From Scandinavian, Icel. kostr. Goth. kustus trial. N. E. D. cost.] cost