Partition off
Definition 1 of 1
Pro Tip 1/3Physical Barrier
The phrase often implies creating a physical barrier within a bigger space. 
The studio apartment was too open, so they decided to partition off a corner for privacy.
Pro Tip 2/3Temporary Change
'Partition off' suggests the division can be temporary and doesn't always need construction. 
They'll partition off the hall with curtains for the event tonight.
Pro Tip 3/3Space Management
The phrase is common in discussions about managing or optimizing use of space. 
They had to partition off part of the warehouse for different goods.