you know something? Meaning in the Cambridge English Dictionary
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Meaning of “you know something?” in the English Dictionary

"you know something?" in British English

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you know something?

(also you know what?) informal said before giving an ​opinion or a ​piece of ​information: You know something? I don't ​think I like that man. You know what? I ​think it's ​time to go ​home.
(Definition of you know something? from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"you know something" in American English

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you know something

(also you know what) infml used before giving an ​opinion or a ​piece of ​information: You ​know what? I ​think it’s ​time to go ​home.
(Definition of you know something from the Cambridge Academic Content Dictionary © Cambridge University Press)
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