Rashi on Deuteronomy 19:16/רש"י על דברים י״ט:ט״ז

1לענות בו סרה [IF A WITNESS FOR VIOLENCE RISE UP AGAINST A MAN] TO TESTIFY AGAINST HIM סרה — i.e. a thing which does not exist at all; this term is used because this witness is far removed (הוסר) from having anything to do with this testimony. How is this? (Give an example of such a case)?! That two other witnesses say, “But were you not with us on that day (when you say you saw the defendant committing this crime) in such and such a place (different from that where the alleged crime, according to you, has taken place)?!” (Makkot 5a).