Usage: 6 forms in 6 verses
Form Translated As     In Verse(s)
συνεκλάσθη was broken in pieces LXX.Jer.50.23
συνέκλασεν He broke in pieces LXX.Lam.2.3
συνέκλασε it fractured LXX.Judg.9.53
συνέκλασασ you broke LXX.Ezek.29.7
συγκλάσω I break in pieces LXX.Isa.45.2
συγκλάσει he shall break in pieces LXX.Ps.46.9

Liddell-Scott-Jones

συγκλάω (sugklaō) to break in pieces together G:V

συγκλάω-κλάω,

break, break off, κλήματα [LXX+5th c.BC+]; of a bad carver, mangle, τὰ μέρη [Refs 4th c.BC+] K.:—passive, of persons engaged in servile occupations, to be cramped or stunted, τὰς ψυχὰς συγκλάωκεκλασμένοι τε καὶ ἀποτεθρυμμένοι διὰ τὰς βαναυσίας [συγκλάωκλῶνται [prev. author] “Tht.” 173a ">Refs 5th c.BC+]; of lines, [Refs 4th c.BC+]

LSJ Scripture Refs: LXX.Ps.45.1*