Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
καρπίζεσθαι to gather my fruit LXX.Prov.8.19
εκαρπίσαντο And they gathered fruit LXX.Josh.5.12

Liddell-Scott-Jones

καρπίζω (karpizō) to gather fruit G:V

καρπίζω-ίζω

__A, (καρπίζωός A) enjoy the fruits of, [Refs]:— elsewhere always in middle, κ. γῆν [LXX+4th c.BC+], etc.; Χρόνον [Refs 4th c.BC+]; but also, exhaust the soil, καρπίζωίζεται τὴν γῆν μάλιστα πυρός [καρπίζωίσατο “epigram Gr.” 516.4 (from Aegae), compare “Supp.epigram” 3.781 (from Gortyn)">Refs 5th c.BC+]; exploit, [Refs 1st c.AD+]; βέλτιον ἐμὲ (i.e. τὴν σοφίαν) καρπίζωίζεσθαι ὑπὲρ Χρυσίον [LXX]
__A.II make fruitful, fertilize, [Refs 5th c.BC+]

LSJ Scripture Refs: LXX.Josh.5.12LXX.Prov.8.19