corner up

Short definition from Wiktionary

Verb

1. 1
   To form one or more corners.
2. 2
   To sell drugs on a street corner; to go to such a spot to sell drugs.
3. 3
   To be in a corner (of a room); to trap or be trapped by assailants in the corner of a room.
4. 4
   to corner or be cornered (To trap in a position of great difficulty or hopeless embarrassment).