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Etymology 1
From.

Verb

 * 1) to fall
 * 2)  to pile up, to accumulate
 * 3)  to throng
 * 4)  to rain down, to fall in large quantities
 * 5)  it rains, it snows, it hails

Verb

 * 1)  to knock down, causing (something)to heap up in piles
 * 2)  to build (a fire)
 * 3)  to apply oneself