Lexical Definition

‎ἀποψύχω‎ apopsýchō (ap-ops-oo'-kho) to faint ^G:V
from ‎ἀπό‎ and ‎ψύχω‎

hearts failing.

• to breathe out, i.e. faint

Abbott-Smith

** ἀπο-ψύχω, [in LXX: IV Mac 15:18*;]
1. to breathe out life, expire (Thuc.; LXX, IV Mac 15:18).
2. to leave off breathing, faint (Hom., Od., xxiv, 348): seq. ἀπό, Lk 21:26.†

Abbott-Smith References

Liddell-Scott-Jones

ἀποψύχω-ψύχω [ῡ]:—

passive, aorist ἀπεψύχθην and ἀπεψύχην [ῠ], see below, also ἀπεψύγην [ῠ] [Refs 3rd c.AD+]:— leave off breathing, faint, swoon, τὸν δὲ.. εἷλεν ἀποψύχωψύχοντα[NT+8th c.BC+]

__2 with accusative, ἀπέψυξεν βίον breathed out life, [Refs 5th c.BC+]: absolutely, expire, die, [LXX+5th c.BC+]; λεπτὸν ἀ. faintly breathing out his life, [Refs 2nd c.BC+]:—also passive, ἀποψύχωψύχεται[Refs 5th c.BC+]: aorist 2 ἀπεψύχη[Refs 4th c.BC+]
__II cool, chill, ὄψα[Refs 3rd c.BC+]:—passive or middle, to be cooled, [Refs 8th c.BC+] they got the sweat dried off their tunics, [ἀποψύχωψυχθείς (by bathing) 21.561">Refs 8th c.BC+] (also in active, ἱδρῶ ἀποψύχωψύχοντε[Refs 5th c.AD+]: generally, grow cold, [Refs 4th c.BC+] cold and indifferent as to.., [ἀποψύχωψυχόμενοι ">Refs 4th c.BC+]shivering with terror, [Refs 2nd c.AD+]; but, to be refreshed, [Refs 5th c.BC+]
__II.2 impersonal, ἀποψύχωψύχει it grows cool, ἐπειδὰν ἀποψύχωψύχῃ[ἀποψύχωψυχῇ (\_aorist 2\_ \_passive\_). ">Refs 5th c.BC+]
__III ἀποψύχωψύχειν· ἀποψύχωπατεῖν, ἀφοδεύειν, [Refs 5th c.AD+]; compare ἀπόψυγμα.

_{LSJ Scripture Refs: Luke.21.26}