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acceleration of light?

article states :

"The body exterts a huge gravitational pull, and to escape its clutches you'd need to accelerate away from it very hard indeed. Now if the body is so dense that escape becomes impossible for everything including light, then the resulting object is called a black hole."

The speed of light is a universal constant, and it does not accelerate. But according to this article, acceleration is needed to escape the body's gravitational pull. Am I missing something here?

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