Vine's Expository Dictionary: View Entry
TDNT Reference: 4:3,495
καταλαλέω katalaléō, kat-al-al-eh'-o; from G2637; to be a traducer, i.e. to slander:—speak against (evil of).
The KJV translates Strong's G2635 in the following manner: speak evil of (4x), speak against (1x).
to speak against one, to criminate, traduce
Strong's Number G2635 matches the Greek καταλαλέω (katalaleō),
which occurs 5 times in 3 verses
in the TR Greek.