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In SMC terms, liquidity refers to areas where a large number of pending orders are likely resting — commonly just above a recent swing high (where short-sellers' stop-losses sit) or just below a recent swing low (where buyers' stop-losses sit).
Because triggering those stops provides the volume needed to fill large institutional orders, price will sometimes push just beyond an obvious high or low — a move often called a "liquidity sweep" — before reversing in the opposite direction.
This is why the most obvious high or low on a chart isn't always the safest place to put a stop-loss, and why some traders treat a sweep of an old high/low followed by a sharp reversal as a higher-probability signal than the raw breakout itself.
Real-World Example
A stock has an obvious swing low that dozens of traders have placed stop-losses just below, all clustered in a tight price zone. Price dips just below that zone, triggers the stops (adding sell volume), and then reverses sharply higher, since the very act of triggering those orders provided exactly the selling liquidity a large buyer needed to fill a big position without moving price against themselves, a pattern liquidity-focused traders watch for specifically, rather than assuming every break of an obvious low is a genuine trend change.
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