If a man spanked me
I would pour boiling water on him in his sleep or poison his food
The threatening of him with a knife thing is not enough, become ungovernable
Before you say "that's not historically accurate" YES IT IS
Women killed bad husbands all the time throughout history and the saying "poison is a woman's weapon" came from husband killings
This is when your husband dies under mysterious circumstances and you are simply mourning too deeply to remarry, or if you do remarry, and the next one steps out of line you murk him too