Sentence examples for a smear from inspiring English sources

The phrase "a smear" is correct and usable in written English.
It can be used to refer to a mark or stain, or in a figurative sense to describe a damaging or false accusation against someone.
Example: "The article was nothing more than a smear against the politician, filled with unverified claims and personal attacks."
Alternatives: "a slander" or "a defamation".