make no mistake about it—is used as a warning that the statement is to be taken seriously:
- We shall insist on having every penny that is due to us, make no mistake about it.
Note: The expression does not correlate in meaning with the phrase and no mistake—without any doubt (used after a statement to emphasize the idea implied):
- It’s boiling hot today, and no mistake!
there’s no mistake about it—there is no doubt about it; it is certain:
- There’s no mistake about it—this is quite simply the best car on the market, sir!
Note: The expression does not correlate in meaning with the phrase there’s no mistaking—it is impossible not to recognize smb. or smth.:
- There’s no mistaking the sect’s women by their black poke-bonnets.