crowd up(redirected from crowding one up)
1. To gather together into a crowd. People started crowded up in front of the store as early as 6 AM ahead of their huge Black Friday sale.
2. To gather or force people together in a crowd. In this usage, a noun or pronoun can be used between "crowd" and "up." The guards crowded us up like cattle to transport us to the new maximum security facility.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.