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clog up

B1 informal separable both
In simple words

When something gets completely blocked and stops working because too much stuff has built up inside it.

Literal meaning: To block ('clog') completely ('up') so nothing can pass through.

Meanings

1 B1 neutral

To block a pipe, drain, or passage with an accumulation of material so that nothing can flow through.

"Grease from cooking had clogged up the kitchen drain completely."

Grammar: separable
2 B1 idiomatic informal

To fill a road, system, or space to the point where it can no longer function effectively.

"The extra traffic from the festival completely clogged up the town centre."

Grammar: separable
3 B2 idiomatic informal

To overwhelm or overload a system, inbox, or process so that it slows down or stops working.

"Spam emails were clogging up her inbox and making it impossible to find important messages."

Grammar: separable
Usage notes

Used both literally (pipes, drains, arteries) and figuratively (systems, processes, roads). The particle 'up' intensifies the sense of complete blockage. Very common in everyday British English.

Commonly used with

drain pipe road artery system filter

Forms

Base
clog up
I/you/we/they
3rd person
clogs up
he/she/it
Past simple
cloged up
yesterday
Past participle
cloged up
have + pp
-ing form
cloging up
continuous

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