a collar :-- Wearm lim gebundenne bǽg hwílum bersteþ the warm limb sometimes escapes from the bound collar, Exon. 102b; Th. 387, 20; Rä. 5, 8. v. beáh.
Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "bǽg." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 66.