hull-down
Of a ship: so far distant that only the masts and sails are visible above the horizonOf a ship: so far distant that only the masts and sails are visible above the horizon.
Meaning
2 senses(not comparable)Of a ship: so far distant that only the masts and sails are visible above the horizon.
(not comparable)Of a tank: stopped with its hull protected by ground to the front, so that its occupants or weapons have a line of sight forward.