phrasal verb clog
When something clogs up
a place, or when it clogs up
, it becomes blocked
so that little or nothing can pass through.
22,000 tourists were clogging up the pavements.
The result is that the lungs clog up with a thick mucus.
clogged up graded adjective
The drains are badly clogged up.
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers