Usage: 4 forms in 4 verses
Form Translated As     In Verse(s)
επικροτούντεσ clapping LXX.Amos.6.5
επικροτεί claps LXX.Prov.17.18
επικροτήσει shall clap LXX.Isa.55.12
επεκρότησαν clapped LXX.Jer.5.31

Liddell-Scott-Jones

ἐπικροτέω (epikroteō) to clap G:V

ἐπικροτέω-έω,

rattle on or over, τὰ δ᾽ ἐπικροτέωέοντα πέτοντο ἅρματα flew rattling over the ground, [Refs]

__2. with accusative, strike with a rattling sound, clash, κύμβαλα 4th c.AD: Alciphro Epistolographus 1.12; κρόταλα 2nd c.AD: Lucianus Sophista “Syr.D.” 44; γένειον 3rd c.AD: Oppianus Apamensis Epicus “Cynegetica” 2.244.
__3. clap, applaud, [Refs 1st c.AD+]
__4. c.dative instrumental, . ὀδοῦσι chatter with one's teeth, Ps.-[Refs 2nd c.AD+]; . τοῖς δακτύλοις snap the fingers, [Refs]