mastbox
nounUK /ˈmɑːstbɒks/
US /ˈmæstbɑːks/
A mastbox is a strong box that holds the tall pole on a ship.
The sailor checked the mastbox to make sure the mast was safe.
OTHER MEANINGS
2. A box-shaped fitting that secures a flagpole or antenna mast.
They bolted the mastbox to the roof before raising the antenna.
3. A storage box kept near a ship's mast for tools and rope.
He grabbed a coil of rope from the mastbox.
4. A protective casing around the base of a tall pole.
The mastbox kept water out of the wooden pole.