The word "strumpet" is a noun that refers to a woman who engages in sexual activity outside of her marriage, often in a way that is considered immoral or promiscuous. It is an old-fashioned word and is rarely used in modern conversation.
While "strumpet" primarily refers to a woman who is unfaithful or promiscuous, in some contexts, it can also be used more generally to refer to women who are perceived as lacking moral standards regarding sexual conduct.
There are no specific idioms or phrasal verbs that directly include "strumpet," but you might encounter phrases like "playing the field," which refers to dating or having relationships with multiple partners.
Remember, "strumpet" is an old-fashioned and very strong word that carries a lot of negative connotation.