Meaning of “(you) mark my words!” in the English Dictionary

british dictionary

"(you) mark my words!" in British English

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(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!

(Definition of “(you) mark my words!” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)