mortar noun

ADJ. heavy They could not move their heavy mortars over the swampy ground.

VERB + MORTAR be armed with, have Their troops were armed with mortars and machine guns. | fire

MORTAR + VERB burst, explode The occasional mortar burst near our truck. | hit sth

MORTAR + NOUN attack, fire We were under constant mortar fire. | bomb, shell hit by a mortar shell