to fall away: to turn aside decisively and deliberately from a commitment one had truly entered, abandoning it
The word is built from two pieces, one meaning "beside" or "aside" and one meaning "to fall," so at root it is "to fall alongside" or to slip aside from a path. In older Greek it usually meant something quite ordinary: an event that happened by chance, an opportunity that came to hand, or simply a blunder. Only over time did it take on a moral edge, coming to mean "to stray, to go wrong, to slip off the right road."
Its heavier meaning comes from the Greek translation of the Old Testament, above all in Ezekiel, where it became the regular word for breaking faith with God, the treachery that brought on exile. There it translates a Hebrew term for covenant betrayal (מָעַל). That background of deliberate unfaithfulness is what the writer of Hebrews reaches for.
In the New Testament the word appears exactly once, in Hebrews 6:6, describing people who "have fallen away" after fully sharing in the Christian life. It is used with no object, leaving the reader to supply what has been abandoned, and it names a considered, decisive turning away from Christ rather than a stumble or a passing lapse. It stands close in force to another word for turning away, ἀφίστημι, used earlier in the same letter of falling away from the living God.
Disputed
Whether the verb is a narrow, technical term for a final and irreversible apostasy, or a broader term for covenant unfaithfulness that need not by itself denote an unforgivable, decisive fall.
- majorityIt carries the full weight of covenant apostasy: a deliberate, decisive renunciation, drawing on Ezekiel's use of the verb for the treachery that led to exile, and functioning as a near equivalent of the letter's other words for defection.; William L. Lane, Hebrews 1-8 (WBC 47A); Harold W. Attridge, Hebrews (Hermeneia); C. Spicq, Theological Lexicon of the New Testament, s.v. παραπίπτω
- minorityIt denotes covenant unfaithfulness more broadly, since in Ezekiel and in Wisdom the verb stands alongside ordinary words for sinning, so it need not by itself carry the sense of a single, unforgivable, final fall.; Randall C. Gleason, The Old Testament Background of the Warning in Hebrews 6:4-8, Bibliotheca Sacra 155 (1998); Hal Harless, Fallen Away or Fallen Down? Hebrews 6:1-9, Chafer Theological Seminary Journal