Idioms and Phrases with make no mistake
make no mistake
Have no doubt, certainly, as in Make no mistake—I'll vote Republican no matter who runs. [Mid-1800s] Also see get someone wrong.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.