Usage: 11 forms in 16 verses
Form Translated As     In Verse(s)
ταχύνη hasten LXX.2Sam.15.14
ταχύνατε Hasten LXX.1Sam.9.12LXX.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.17.48LXX.1Sam.25.42LXX.2Sam.19.16
he hastened LXX.Gen.18.7
ετάχυναν they hastened LXX.Ps.16.4LXX.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 βραδύνουσαν ἀκμὴν προδιαγνῶναι [Refs 2nd c.AD+]

LSJ Scripture Refs: LXX.Gen.18.7