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1. To collect or gather. Used tissues heaped up next to my bed while I was sick.
2. To gather or form something into a pile. In this usage, a noun or pronoun can be used between "heap" and "up." Heap the dirt up, and I'll come sweep it into the dust pan.
heap something up
to make something into a pile. He heaped the mashed potatoes up on my plate, because he thought I wanted lots. Heap up the leaves in the corner of the yard.
1. To pile something up: I heaped up the dirty clothes in the corner of my room. The floodwaters heaped debris up onto the beach.
2. To accumulate: Garbage heaped up in the streets.