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English definition of “I know”

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I know

B1 said when you suddenly think of a good idea, an answer, or a solution: I know - let's go to the beach! B2 said to show you agree with something someone has just said: "But he's so awful." "I know - he's dreadful."
(Definition of I know from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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