Be assured; be certain.
Synonym: believe me
Used other than figuratively or idiomatically: see make, no, mistake.
Source: en.wiktionary.orgBut the reason I got involved in public service, by and large, if I had to credit one thinker, one person, it would be Ayn Rand. And the fight we are in here, make no mistake about it, is a fight of individualism versus collectivism. Paul Ryan
I would like to stress here that a lasting peace in the Chechen republic and so-called peace talks with the bandits are not the same thing, and I would ask everyone to make no mistake about that. Boris Yeltsin
Make no mistake about it: Operation Desert Storm truly was a victory of good over evil, of freedom over tyranny, of peace over war. Dan Quayle
Make no mistake about why these babies are here - they are here to replace us. Jerry Seinfeld
In this different kind of war, we may never sit down at a peace table. But make no mistake about it, we are winning, and we will win. George W. Bush
But some governments will be timid in the face of terror. And make no mistake about it: If they do not act, America will. George W. Bush