Usage: 12 forms in 15 verses
Form Translated As     In Verse(s)
επιχαρώσί rejoice over LXX.Ps.38.16
επιχαρούνται they shall rejoice LXX.Hos.10.5
επιχαρούμεθα We shall rejoice LXX.Mic.4.11
επιχαρείησάν rejoice against LXX.Ps.35.19LXX.Ps.35.24
επιχαρήσ have rejoiced LXX.Obad.1.12
rejoice over LXX.Prov.24.17
επιχαρή rejoice LXX.Ps.41.11
επιχαίρων rejoicing at LXX.Prov.17.5
επιχαίροντεσ rejoicing LXX.Ezek.25.15
rejoicing at LXX.Ps.35.26
επιχαίρει rejoices over LXX.Prov.17.18
επεχάρητε you rejoiced LXX.Ezek.25.3
επεχάρησ rejoiced LXX.Ezek.25.6
επίχαιρέ Rejoice not LXX.Mic.7.8

Liddell-Scott-Jones

ἐπιχαίρω (epichairō) to rejoice at G:V

ἐπιχαίρω,

rejoice over, exult over, mostly of malignant joy, with dative of things, κακοῖς τοῖς τοῦδε [Refs 5th c.BC+]: also in aorist I middle, ἐπεχήρατο [Refs 3rd c.BC+]:—passive, [Refs 1st c.BC+]

__2 rarely in good sense, ἐπιχαρῆναι (aorist 2 passive) rejoice in another's joy, [ἐπιχαίρω 5th c.BC: Sophocles Tragicus “Ajax” 136 (\_anapaest meter\_). ">Refs 5th c.BC+]
__3 take pleasure in, with dative, [Refs 3rd c.AD+]