διαφῠλάσσω · diaphylassō — LSJ
watch closely, guard carefully, τὰ τείχεα, τὴν πόλιν, Hdt. 6.101, 133; τὴν πάροδον Lys. 2.30; τὰ ἀγαθά Isoc. 2.6, cf. SIG 577.15 (Milet., iii/ii B.C.); esp. of providential care, LXX Ps. 90(91).11, al., cf. PGiss. 17.7 (Hadr.), etc.:—Med., guard for oneself, πόλιν E. IA 369.
observe closely, τὰ μέτρα Hdt. 2.121.αʹ
observe, maintain, τοὺς νόμους Pl. Lg. 951b, cf. SIG 1044.10 (Halic., iv/iii B.C.), PTeb. 25.3 (ii B.C., Pass.); εἰρήνην Philipp. ap. D. 18.78; τὴν πρός τινα πίστιν Plb. 1.78.8; εὔνοιαν IG 12(7).241.22 (Amorgos, iii B.C.); δ. τὸ μὴ σπουδάζειν guard against being too particular . ., Pl. Plt. 261e; πλῆθος δ. ὅτι μάλιστα ταὐτὸν αὑτῶν εἶναι take care that . ., Id. Criti. 112d.
remember, retain, Luc. Tim. 1, Cont. 7.