Wood or metal supports used in mines to prevent cave-ins.
Stulls are important for keeping miners safe underground.
Examples:
The miners placed stulls to keep the mine from falling.
The stulls help the mine stay strong.
He saw the stulls in the dark mine.
The stulls are like the bones of the mine, keeping it strong.
Without the stulls, the mine would fall down.
The stulls are like the pillars of the mine, holding it up.