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English definition of “(you) mark my words!”

(you) mark my words!

old-fashioned
something that you say when you tell someone about something that you are certain will happen in the future: He'll cause trouble - you mark my words!Paying attention and being carefulCautious and vigilant
(Definition of (you) mark my words! from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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