Sarah (distinct from the name Sarah meaning 'princess') refers to rebellion, apostasy, or willful turning aside from God or His commands. It appears about 8 times and captures the deliberate, defiant nature of covenant unfaithfulness — not accidental sin but willful departure.
The OT prophets diagnose Israel's core problem not as ignorance but as sarah — willful turning away from God. Isaiah 1:5 uses the word to describe the nation that has 'turned away [sarah] more and more' despite correction. This kind of rebellion is not a stumble but a chosen direction. The New Testament equivalent is apostasia (2 Thessalonians 2:3), which comes from the same concept. Theologically, sarah represents the gravity of covenant unfaithfulness — the sin of those who know better but choose otherwise. It grounds the prophetic call to shuv (return) — rebellion can and must be reversed.