堆 (duī): để pile up

On moving day, the living room was piled full of unopened cardboard boxes; there wasn't even room to walk.

Autumn arrived, and the fallen leaves in the yard piled up into a small hill; the children jumped in and had a wonderful time.

Please pile these books neatly in the corner; don't just throw them on the floor.

There's a lot of work at the end of the year; a huge pile of documents has piled up on my desk, and I'll have to work overtime to get through it all.

After it snowed, the children piled up a big snowman at the door and even put a hat and scarf on it.