I guess you mean, "Momentum precedes Price", check this very interesting article on Momentum, should help you understand:
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imagine a car which is about to take a U turn. for that, it should slow down before taking that turn. the same happens most of the time during reversals in the market. people interpret this information in a wrong sense. every car that is slowing down(decreasing momentum/acceleration) doesn’t need to reverse. similarly, every momentum reversal need not result in a trend reversal. we make our eyes wide open when momentum reverses and observe the price for more clues…
hope it helps…