From the middle voice of a compound of epi and sunistao; a conspiracy, i.e. Concourse (riotous or friendly) -- that which cometh upon, + raising up.
see GREEK epi
see GREEK sunistao
1. a hostile banding together or concourse: ποιεῖν ἐπισύστασιν, to excite a riotous gathering of the people, make a mob, Acts 24:12 R G; 1 Esdr. 5:70 Alex.; Sextus Empiricus, adv. eth., p. 127 (p. 571, 20 edition, Bekker; cf. Philo in Flac. § 1); τίνος, against one, Numbers 26:9; a conspiracy, Josephus, contra Apion 1, 20.
2. a troublesome throng of persons seeking help, counsel, comfort: τίνος, thronging to one, 2 Corinthians 11:28 R G (see ἐπίστασις); Luther,dassichwerdeangelaufen.