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English definition of “reduce”

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reduce

verb [I or T] uk   /rɪˈdjuːs/ us    /-ˈduːs/
B1 to make something smaller in size, amount, degree, importance, etc.: Do nuclear weapons really reduce the risk of war? The plane reduced speed as it approached the airport. My weight reduces when I stop eating sugar. We bought a television that was reduced from €500 to €350 in the sales. To make a thicker sauce, reduce the ingredients by boiling for five minutes. I reduced the problem to a few simple questions.
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(Definition of reduce from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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