Wiktionary
vb. (context transitive idiomatic English) to completely physically block
WordNet
Usage examples of "clog up".
The likelihood of any given person being killed in a terrorist attack are infinitesimally smaller than the likelihood that the same person will clog up his arteries with fatty food and die of heart disease.
In fact, you would expect that sort of silvery ripple as a random effect, just the way heavily trafficked highways will clog up and then flow freely again.
They clog up my head and keep me from seeing what's really important.
The hydrofoil mode is fast on the surface, but the foil struts clog up easily in thick kelp.
All these original geniuses will be more than happy to clog up the bar, sucking down free drinks, taking credit for this bold venture-until the place starts running into trouble, at which point they dematerialize, shaking their heads at their foolish dentist who just didn't seem up to the job.
So far I have learned that long hair will clog up the shower drain before you can say “.
Smooth, short hair with no undercoat to shed and clog up airfilters.