grist for the mill

go through the mill

To experience the suffering or discipline necessary to bring one to a certain degree of knowledge or skill, or to a certain mental state.

grist to the mill

Alternative form of grist for the mill.

pill mill

A clandestine operation where a medical worker illicitly offers prescription medication to patients in exchange for bribes.

rumor mill

A process in which a group or network of persons originate or promulgate gossip and other unsubstantiated claims.

through the mill

Through a period of bad treatment or an ordeal.

trouble at mill

Problems outside the household, especially in the workplace.

water to one's mill

That which energizes or stimulates one.