Dictionary entry

ἀποκαταλλάσσω

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament with Strong's

*† ἀπο-κατ-αλλάσσω

(cf. καταλλάσσω: ἀπό here signifies completely, v. Lft., Col., 1:20, 21; Ellic., Eph., 2:16; but also Mey., Eph., 2:16),

to reconcile completely: Eph 2:16, Col 1:20, 21.†