To jump into such a pile.
To cause a group of people to lie in a pile upon another, originally as a punishment to the victim on the bottom.
To act similarly with regard to residential density: to live or cause to live in high-density settlements.
A disorderly pile of people formed by jumping upon a victim.
to pile up; to accumulate.
To put a group of abstract things together.
To put into a stack.
Often followed by against or among: to compare with (something); to measure up.