What is Breaker Block?
A failed Order Block that price has broken through — it flips polarity and acts as support/resistance from the opposite side when revisited.
When an Order Block fails — price bursts through without the expected reaction — the zone does not become useless. It becomes a Breaker Block: the trapped traders who positioned at the original OB are now underwater, and when price returns to the zone they exit at break-even, supplying order flow in the breakout direction.
A bullish breaker forms when a bearish OB is broken upward: on the retest, old sellers buying back + new buyers stepping in turn the old supply zone into demand. Bearish breaker mirrors it.
The breaker entry is strongest when the break also swept liquidity beyond a swing point first (sweep → break → retest), because the trapped population is largest. Stop beyond the breaker's far edge.