When something clogs up a place, or when it clogs up, it becomes blocked so that little or nothing can pass through. [V P n (not pron)] [V P] 使阻塞;使堵塞；
22,000 tourists were clogging up the pavements…
2.2万名游客将人行道堵得水泄不通。
The result is that the lungs clog up with a thick mucus.
检验结果是肺部被厚厚的黏液堵住了。