ἐφηλόω

A. nail on, in Pass., Apollod. Poliorc. 158.8, Ath.Mech. 25.3: metaph., τῶνδ’ ἐφήλωται τορῶς γόμφος διαμπάξ the bolt is driven home, i. e. it is irrevocably fixed, A. Supp. 944; cf. ἐφαλόω.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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