אַף־הִ֭יא כְּחֶ֣תֶף תֶּֽאֱרֹ֑ב וּ֝בוֹגְדִ֗ים בְּאָדָ֥ם תּוֹסִֽף׃
She also lieth in wait as a robber, and increaseth the faithless among men.
Rashi on Proverbs
and she will increase the faithless among men She increases in Israel those who are faithless to God. He is referring to apostasy.