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3.
Phrase said before or after a prediction or declaration to mean: "You should write down what I say (mentally or literally), because it will come true or be something unforgetable."

Usually said in warning or in a betting situation, so that you can win a wager or say I told you so later.

Intended to convey great conviction, as though your statement could be doubted or denied by others.
"Mark my words, that car will break down on the way there."

"If you go, mark my words, your stuff will be on the lawn when you get back."

"That marriage won't last a year; mark my words."
by Coell February 24, 2006
 
1.
Phrase said before or after a prediction or declaration to mean: "You should write down what I say (mentally or literally), because it will come true or be something unforgetable."

Usually said in warning or in a betting situation, so that you can win a wager or say I told you so later.

Intended to convey great conviction, as though your statement could be doubted or denied by others.
"Mark my words, that car will break down on the way there."

"If you go, mark my words, your stuff will be on the lawn when you get back."

"That marriage won't last a year; mark my words."
by Coell March 22, 2006
 
2.
Listen to what I say now, I am sure it will turn out to be true.
It will snow in Greenland this winter you mark my words.
by Blue Cawdrey November 23, 2004