to encamp about a place :-- Héht ymbwícigean Æthanes byrig mearclandum on (castrametati sunt in Etham in extremis finibus solitudinis, Ex. 13, 20), Cd. Th. 181, 22 ; Exod. 65.
Cite the scanned version of the original dicionary like this:
Bosworth, Joseph. "ymb-wícian." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth. Ed. Thomas Northcote Toller. Oxford: Clarendon Press, 1898. 1299.