φρουρεῖν
From LSJ
τὸ τῶν γεωργῶν ὅσαι τε ἄλλαι τέχναι (Plato, Timaeus 17c10) → the class of farmers and other such crafts(men)
Greek > English (Woodhouse Verbs Reversed)
(see also φρουρέω): guard, protect, watch, be on the look out, keep watch
Lexicon Thucydideum
praesidio esse, to protect, 1.64.1, 1.64.11.103.4. 2.80.4, 2.83.1. 3.17.3, 3.90.2. 4.1.4, 4.24.1. 4.66.4. 4.113.2. 5.33.1. 5.33.2. 5.35.6, 5.39.1. 5.64.3, 7.4.3. 7.24.1. 7.60.2. 8.35.3. 8.74.2.