堵塞 (dǔ sè): 막다.

A heavy rain fell on Monday afternoon, and the drains in the city center got clogged with leaves and trash; the water on the road soon rose above people's ankles.

He has been under a lot of pressure lately and loves greasy food; the doctor said his blood vessels are seriously blocked and he must be hospitalized for treatment right away.

Because of an accident ahead, the highway was blocked for nearly two hours, and many drivers had no choice but to get out of their cars and wait by the roadside.

Every time there is a big sale, the subway exit leading to the mall gets so clogged with shoppers that it is completely packed, and the security guards have to stand nearby to keep order.

The kitchen pipes in this old building have aged, and grease has clogged them up; dirty water is bubbling out of the sink, so we had to call a repairman to clear them.