ἀφυλακτέω

A. to be off one's guard, X. An. 7.8.20, Eq.Mag. 5.15: c. gen., to be careless about, Id. Cyr. 1.6.5:—Pass., to be ill-guarded, Plb. 5.73.10, cf. Onos. 42.15.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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