Lexical Definition

‎ἀποτάσσομαι‎ apotássomai (ap-ot-as'-som-ahee) to leave ^G:V
middle voice from ‎ἀπό‎ and ‎τάσσω‎

bid farewell, forsake, take leave, send away.

• literally, to say adieu (by departing or dismissing)
• figuratively, to renounce

Abbott-Smith

ἀπο-τάσσω, [in LXX: Ec 2:20 (יאשׁ pi.), I Es 6:27, Je 20:2, I Mac4*;]
to set apart. Mid., in late Gk. (Bl., § 37, 1; Swete, Mk., 136 f.; MM, s.v.), c. dat.,
(a) to take leave of: Mk 6:46, Lk 9:61, Ac 18:18, 21, II Co 2:13;
(b) to forsake: Lk 14:33.†

Abbott-Smith References

Liddell-Scott-Jones

ἀποτάσσω,

Attic dialect ἀποτάττω, set apart, assign specially, χώραν τινί[Refs 5th c.BC+]; detach soldiers, [Refs 2nd c.BC+] — passive, ἀποτεταγμένη ἀρχή distinct office, [Refs 4th c.BC+]: generally, to be fixed, appointed, χῶρος[Refs 1st c.AD+]; ear-mark, ἀργύριον εἰς δημοθοινίαν -τεταγμένον[Refs]

__II appoint, settle definitely, [Refs 4th c.BC+]
__III remove, exclude, τόπον τοῦ κόσμου[Refs 2nd c.AD+]
__IV Med, ἀποτάσσομαί τινι bid adieu to a person, part from them, [NT+5th c.BC+]; have done with, get rid of a person, [Refs 1st c.AD+]; ἀ. τῷ βίῳ commit suicide, [Refs]: also with dative of things, renounce, give up, τοῖς ἑαυτοῦ ὑπάρχουσιν[NT+1st c.AD+]; ταῖς μίξεσι, of the Vestals, [Refs 1st c.AD+]

_{LSJ Scripture Refs: Luke.9.61 ☩ Acts.18.21 ☩ Mark.6.46 ☩ Luke.14.33}