Other forms: mandamuses
A mandamus is an order passed down from a court requiring that an official perform some particular function as an absolute duty.
If a public official tries to do his job in whatever way he sees fit, a court might issue a mandamus, telling him, "This is your duty — do it. Or else." Say you're a dogcatcher and you've been looking the other way while Tootles runs free, digging up flower beds. A court might issue a writ of mandamus ordering you to put Tootles in the pound. It's no longer up to you — it's time to bring Tootles in.