Lexical Definition

‎καπηλεύω‎ kapēleúō (kap-ale-yoo'-o) to peddle ^G:V
from (a huckster)

corrupt.

• to retail, i.e. (by implication) to adulterate (figuratively)

Abbott-Smith

* καπηλεύω (< κάπηλος, a huckster, cf. Is 1:22(LXX), Si 26:29),
to make a trade of (RV, mg., make merchandise of), or perhaps (cf. Is 1:22(LXX)) to corrupt (RV, txt.): II Co 2:17.†

Abbott-Smith References

Liddell-Scott-Jones

καπηλεύω-εύω,

to be a retail-dealer, drive a petty trade, [Refs 5th c.BC+]; δι᾽ ἀψύχου βορᾶς σίτοις καπήλευ᾽ drive a trade, chaffer with your vegetable food, [Refs 5th c.BC+]

__II with accusative, sell by retail, τὸν ἕρπιν [Refs 6th c.BC+]
__II.2 metaphorically, κ. τὰ πρήγματα, of Darius, [Refs 5th c.BC+]; κ. τὰ μαθήματα sell learning by retail, hawk it about, [NT+5th c.BC+]; so ἔοικεν οὐ καπηλεύσειν μάχην will not peddle in war, i. e. fight half-heartedly, [Refs 4th c.BC+]; κ. τὴν πολιτείαν traffic in grants of citizenship, [Refs 2nd c.AD+]; κ. τῆς ὥρας ἄνθος or τὴν ὥραν, of prostitutes, [Refs 1st c.AD+]; εἰρήνην πρὸς Ῥωμαίους Χρυσίου κ. [Refs 2nd c.AD+]; τύχη καπηλεύουσα.. τὸν βίον playing tricks with life, corrupting it, [Refs 6th c.AD+]

_{LSJ Scripture Refs: 2Cor.2.17}