block up
phr. v..phr. v.. to fill a space or a pipe so that nothing can pass through it.
phr. v.. to obstruct an opening, passage, or pipe completely, preventing the flow of liquids, air, or traffic.
Leaves often block up the drains in autumn.
The sink is taking a long time to empty because hair and soap have started to block up the pipes.
Heavy snowfall during the night threatened to block up the narrow mountain passes, effectively isolating the small village from the rest of the valley.
often used in the passive voice or with physical objects like pipes, noses, or roads.
contrast with 'block' (the simple verb); adding 'up' emphasizes the completeness of the obstruction or the gradual process of it becoming totally filled.
The drain is block up.The drain is blocked up.when describing the state of the object, you must use the past participle 'blocked' as an adjective.