Usage: 11 forms in 16 verses
Form Translated As     In Verse(s)
ταχύνη hasten LXX.2Sam.15.14
ταχύνατε Hasten LXX.1Sam.9.12 • LXX.2Sam.15.14
ταχύνασ In hastening LXX.1Sam.20.38
ταχύναντεσ hastening LXX.Gen.45.13
ταχυνεί God will hasten LXX.Gen.41.32
ταχυνέτω hasten LXX.Eccl.5.2
τάχυνον Hasten LXX.Ps.31.2
εταχύνατε you hastened LXX.Exod.2.18
ετάχυνεν hastened LXX.Judg.13.10
ετάχυνε hastened LXX.1Sam.17.48 • LXX.1Sam.25.42 • LXX.2Sam.19.16
he hastened LXX.Gen.18.7
ετάχυναν they hastened LXX.Ps.16.4 • LXX.Ps.106.13

Liddell-Scott-Jones

ταχύνω (tachunō) to hasten G:V

ταχύνω,

make quickly, κοιλὴν κάπετον χερσὶ ταχύνατε [Refs 5th c.BC+]; τάδε τοί με σπερχόμενος ταχύνει such are the words by which he urging hastens me, i.e. urges me to hasten, [Refs 5th c.BC+]:— passive, σελὶς ταχυνομένη quickly written, [Refs 1st c.BC+]

__II intransitive, to be quick, make haste, hurry, [LXX+5th c.BC+]
__II.2 to be early, ταχύνουσαν ἢ βραδύνουσαν ἀκμὴν προδιαγνῶναι [Refs 2nd c.AD+]

LSJ Scripture Refs: LXX.Gen.18.7