to hit something very hard several times and make a lot of noise, damage it, break it into smaller pieces etc:
hit[intransitive and transitive]
He began pounding the keyboard of his computer.
Thomas pounded on the door with his fist.
Waves pounded against the pier.
pound something against/on something
Green pounded his fist on the counter.
if your heart or blood is pounding, your heart is beating very hard and quickly
Patrick rushed to the door, his heart pounding with excitement.
She ran, her heart pounding in her chest.
if your head is pounding, it feels painful, especially because you have a headache or you have been using a lot of effort
to walk or run quickly with heavy loud steps
move[intransitive always + adverb/preposition, transitive]
pound along/through/down etc
I could hear him pounding up the stairs.
a policeman pounding his beat
Runners will be pounding the pavement this weekend during the London Marathon.
to attack a place continuously for a long time with bombs:
attack with bombs[transitive]PMW
Enemy forces have been pounding the city for over two months.
pound something ↔ outphrasal verb
The Rolling Stones were pounding out one of their old numbers.