mark my [word]
1
used when one is certain that something will happen at some point in the future
The phrase "mark my word" is an idiom that is used to encourage someone to pay attention to a promise, statement, or prediction. The origin of this phrase is not well-documented, but it has been in use for several centuries and is often used to emphasize the speaker's sincerity or confidence in what they are saying.
- I've never seen a more talented athlete; mark my word, she'll be an Olympic champion someday.
- Mark my words, the weather forecast is calling for a severe storm later today.
- Despite the odds, I believe we'll succeed in this endeavor; mark my word, we'll prove the doubters wrong.
- Mark my word, this novel will become a bestseller; the story is captivating and unique.