Usage: 8 forms in 8 verses
Form Translated As     In Verse(s)
επισυστώμεν We should rise up together LXX.Jer.20.10
επισυστήτε Rise up together against LXX.Jer.20.10
επισυστήσονται shall rise up together LXX.Ezek.2.6
επισυστήση rise up together LXX.Lev.19.16
επισυστάσησ ones rising up together LXX.Num.27.3
επισυστάντεσ ones rising up together LXX.Num.26.9
επισυνεσταμένη rising up together LXX.Num.14.35
επισυνέστησεν rose up together LXX.Num.16.19

Liddell-Scott-Jones

ἐπισυνίστημι (episunistēmi) to rise up together against G:V

ἐπισυνίστημι-ίστημι

(also ἐπισυνίστημι-ιστάω [Refs 1st c.AD+], cause to coagulate afterwards, γάλα [Refs 2nd c.BC+]

__2 band together, τινὰς κατά τινος J. [prev. cited]; φθορὰ . πλείους τισί [Refs]; simply, incite to conspiracy against, τινὶ τὸν υἱόν [Refs 1st c.BC+]
__II passive with future -στήσομαι[Refs 2nd c.AD+], and aorist 2 and perfect active:—to be collected, gather upon, with dative, [Refs 5th c.BC+]
__II.2 to be classed along with, τὸ ποιητικὸν τῆς ἀλγηδόνος ἐπισυστήσεται τῇ ἀλγηδόνι S.E. [prev. cited]
__II.3 come into being afterwards, [Refs 5th c.AD+]; to be made up of, ἐκ προτέρων τινῶν [Refs 4th c.AD+]
__II.4 conspire against, attack or resist jointly, τινί [Refs 5th c.BC+]
__II.4.b combine to oppose, εἰ δ᾽ ἄν τις -συνίστατοι ταῖς ἐσδόσεσι τῶν ἔργων [Refs 4th c.BC+]