pin (someone or something) under (someone or something)
To restrain or immobilize someone or something under someone or something else. Often used in passive constructions. The earthquake pinned me under a fallen beam. He was pinned under the giant wrestler. I pinned the trap under a hefty boulder to keep it from being blown away.
pin someone or something under someone or something
to trap someone or something under someone or something. Someone knocked Gerry down and pinned Randy under him. The accident pinned Maggie under the car.