Liddell-Scott-Jones

ἀποσχίζω (aposchizō) to sever ^G:V

ἀποσχίζω-σχίζω,

split, cleave off, ἀπὸ δ᾽ ἔσχισεν αὐτήν [τὴν πέτρην] [Refs 8th c.BC+]; tear off, [Refs 5th c.BC+]

__2 sever, detach from, τινὰ ἀπὸ τοῦ συμμαχικοῦ[Refs 5th c.BC+]; ἀ. Αυδούς part them off, separate them, [Refs 5th c.BC+] — passive, ἀποσχίζωσχισθῆναι ἀπό.., of a river being parted from the main stream, [Refs 5th c.BC+]; of a tribe detached from its parent stock, [ἀποσχίζωσχισθέντες τῆς ἄλλης στρατιῆς 5th c.BC: Herodotus Historicus 8.35, compare 7.233, 5th-6th c.BC: Plato Philosophus “Politicus” 267b, etc.">Refs 5th c.BC+]:—middle, separate oneself, [Refs 4th c.AD+]
__3 metaphorically, ἀ. τινὰ τοῦ λόγου cut him off from his speech, interrupt him in it, [Refs 5th c.BC+]