ἐμφρουρεῖν
From LSJ
κόραξ δ' ἐπαίνῳ καρδίην ἐχαυνώθη → the flattered crow was filled with pride, the flattered crow became elate in heart
Greek > English (Woodhouse Verbs Reversed)
(see also: ἐμφρουρῶ, ἐμφρουρέω) be on guard
Lexicon Thucydideum
custodias agere in loco, to keep watch at a place, 4.110.1, 8.60.1.