__ up; amass
I believe the answer is:
pile
(Other definitions for pile that I've seen before include "Part of reactor" , "Arrange in stacks" , "Post" , "Large number" , "Stake" .)
I believe the answer is:
pile
(Other definitions for pile that I've seen before include "Part of reactor" , "Arrange in stacks" , "Post" , "Large number" , "Stake" .)