Cite the scanned version of the original dicionary like this:
Toller, T. Northcote, and Joseph Bosworth. "á-cweccan." An Anglo-Saxon Dictionary: Based on the Manuscript Collections of the Late Joseph Bosworth : Supplement. Oxford: Clarendon Press, 1921. 6.
;p. -cwehte; pp. -cweht To move quickly, to shake, vibrate; movere, quatere, vibrare :-- Æsc acwehte he shook the ash, i. e. the lance, Byrht. Th. 140, 59; By. 310.