a large untidy pile of things:
a rubbish heap
There was a heap of stones where the building used to be.
in a heap
The envelopes for posting lay in a heap on her desk.
We piled the branches into heaps for burning.
a lot of something
The children have heaps of energy.
heaps better/bigger etc (=much better, bigger etc)
to fall down and lie without moving:
They finally collapsed in a heap on the grass.
an old car that is in bad condition
high up and successful or low down and unsuccessful in an organization or in society:
The very poor are at the bottom of the heap.
6 British English old-fashioned informal
to be suddenly very surprised or confused