1. n - the end of a piece of lumber or stick.
2. v - The act of placing two pieces of scenery or material together. eg " I need you to butt that platform right up to the flat.
3. adv - a type of wood joinery. see Butt Joint.
4. n - the end of a rifle that goes against your shoulder when fireing. eg. " We need to fix the butt of that rifle, the dancers broke it last night in the christmas scene."