crust
From LSJ
Ἐχθροὺς ἀμύνου μὴ ‘πὶ τῇ σαυτοῦ βλάβῃ → Ulciscere hostem, non tamen damno tuo → Die Feinde wehre ohne Schaden für dich ab
English > Greek (Woodhouse)
subs.
Of bread: use bread.
A thin crust of ice had formed in it (the trench): P. κρύσταλλος ἐπεπήγει οὐ βέβαιος ἐν αὐτῇ (Thuc. 3, 23).