Henry George Liddell, Robert Scott, A Greek-English Lexicon

A.“ἠγγύησα” E.IA703, D.29.47, etc.: pf. “ἠγγύηκα” D.C.38.9: plpf. “ἠγγύηκει” Is.3.58:—Med., fut. -ήσομαι D.24.46: aor. “ἠγγυησάμην” And. 1.44,73, D.22.53:—Pass., aor. ἠγγυήθην （ἐξ-, κατ-) Lys.23.11, D.59.49: pf. ἠγγύημαι （δι-) Th.3.70:—also treated as a compd., “ἐνεγυησάμεθα” PEleph. 27.9 (iii B. C.), and freq. in codd.: impf. “ἐνεγύων” Is.3.45, D.41.16; “ἐνεγύησα” Is.3.36,70: pf. ἐγγεγύηκα ib.40, D. 59.53: impf. Pass. “ἐνεγυᾶτο” Is.3.70: pf. “ἐγγεγύημαι” D.33.24, POxy. 259.7 (i A.D.): plpf. “ἐνεγεγύητο” Is.3.55: but these forms are incorrect: (ἐγγύη):—give or hand over as a pledge:—Med., have a thing pledged to one, accept as a surety, “δειλαί τοι δειλῶν γε καὶ ἐγγύαι ἐγγυάασθαι” Od.8.351 (nowhere else in Hom.).

2. esp. of a father, plight, betroth, “θυγατέρα ἐγγυᾶν τινι” Hdt.6.57 (v. infr.); Ζεὺς ἠγγύησε καὶ δίδως' E.IA703:—Med., have a woman plighted or betrothed toone, c. acc., D.57.41:—Act. and Med. opposed, Hdt.6.130:—Pass., of the man, to be betrothed, “θυγατρί τινος” Pl.Lg.923d.

II. Med., pledge oneself, give security, “ἐγγύας ἐγγυησάμενοι πρὸς τὸ δημόσιον” And.1.73, cf. Pl.Lg.953e; “ἐπί τισι” Lys.23.9; “ἐ. τινὶ ὅτι . . ” Pl.Euthd.274b.

2. c. acc. et inf. fut., promise or engage that . . , Pi.O.11(10).16, Ar.Pl. 1202, X.An.7.4.13, Pl.Prt.336d, etc.; “ἐγγυᾶσθαί [τινα] καὶ ὁμολογεῖν παρέξειν” Lys.13.23; “ἐγγυωμένη δώσειν” Babr.58.10.

3. c.acc. rei, answer for, “ἐγγυᾶσθαι τὰ μέλλοντ᾽ ἔσεσθαι” D.18.191: c.acc. pers., Pl.Lg.855b; ἐγγυᾶσθαί τινά τινι give surety for him to another, D.33.28; “ἐγγύην ἐγγυᾶσθαί τινα πρός τινα” Pl.Phd.115d; ἐ. τὰ μετέωρα give guarantees without security, SIG364.46 (Ephesus, iii B.C.).