Usage: 11 forms in 18 verses
Form Translated As     In Verse(s)
λεπτύνουσι they shall thin out LXX.Jer.48.12
λεπτύνον making fine LXX.Dan.7.7LXX.Dan.7.19
λεπτύνει makes fine LXX.Dan.2.40
λεπτυνώ I will make them as fine LXX.Ps.18.42
λεπτυνείσ shall thin out LXX.Isa.41.15
λεπτυνεί he shall thin them out LXX.Ps.29.6
it shall be made fine LXX.Dan.2.40
it shall thin LXX.Dan.2.44
ελεπτύνθησαν they were thinned out LXX.Dan.2.35
ελεπτυνά αυτούσ I made them fine LXX.2Sam.22.43
ελέπτυνεν it fine LXX.2Kgs.23.6
it thinned them out LXX.Dan.2.34
made fine LXX.2Kgs.23.15
ελέπτυνε fine LXX.2Chr.34.4
it thinned LXX.Dan.2.45
ελέπτυναν made fine LXX.Dan.6.24
they fine LXX.2Chr.23.17

Liddell-Scott-Jones

λεπτύνω (leptunō) to make fine G:V

λεπτύνω-ω,

future - ῠνῶ [LXX]: aorist 1 ἐλέπτυνα [Refs 5th c.BC+]:—passive, aorist λεπτύνωθην [Refs]: perfect λελέπτυσμαι [Refs 4th c.BC+]; infinitive λελεπτύνωθαι [Refs 2nd c.AD+]: (λεπτός): —make thin or meagre, αἱ ταλαιπωρίαι λ. [τὰ πρόβατα] [Refs 4th c.BC+]; λ. τὸ σχῆμα [τῶν ταγμάτων] [λεπτύνωων 2nd c.AD: Babrius Fabularum Scriptor 103.5 ">Refs 2nd c.BC+]:—passive, to be reduced, grow lean or slender, [λεπτύνωεσθαι 5th-6th c.BC: Xenophon Historicus “Symposium” 2.17 ">Refs 5th c.BC+]; λελεπτυσμένος (-ισμένος codex) κατὰ τὴν οὐράν, of a serpent, [Refs 3rd c.AD+]; of things, to be rarefied, [Refs 4th c.BC+]

__2 comminute or liquefy food in digestion, [Refs 1st c.AD+]; -ύνουσα δίαιτα diet productive of thin humours, [Refs 2nd c.AD+]:—passive, become fluid, opposed to παχύνεσθαι, of foods, [Refs 5th c.BC+]
__3 thresh, winnow, λ. Δηοῦς καρπόν [Refs]

LSJ Scripture Refs: LXX.Ps.17.42*