γειτνι-άω · geitni-aō — LSJ
to be a neighbour, be adjacent, Ar. Ec. 327, D. 55.3, PTeb. 105.19 (ii B. C.), Plb. 6.33.10, Jul. Or. 5.168a, etc.:—chiefly in Prose, but Ep. part., γειτνιόωσαν πόντῳ IG 14.889 (Sinuessa).
border on, resemble, γ. τῇ πολιτείᾳ Arist. Pol. 1295a33; [τῷ καλῷ] Id. Rh. 1367b12; νόσος γειτνιῶσα θανάτῳ Ph. 2.548; τινὶ κακῷ Metrod. Herc. 831.3: later fut. -άσω Gal. 3.690: aor. ἐγειτνίᾱσα Ps.-Luc. Philopatr. 1.