zǔ​sè

clog

阻塞 zǔ​sè
clog verb
to hinder the movement of substances like liquid or air through a pipe, vessel, or channel
block verb
to obstruct a road, path, or traffic flow, making it difficult or impossible to pass through

A traffic accident caused severe congestion on this stretch of road.

Frequency

Movie subtitles
2.24 per million appears in 1% of films
Written text
4.88 per million

Sources

Definitions
CC-CEDICT