堵 (dǔ) means “to block up (a road, pipe etc); to stop up (a hole); (fig.) (of a person) choked up with anxiety or stress; wall (literary); (classifier for walls)”. It is an HSK 4 Chinese character in the HSK 3.0 vocabulary.
下水道被堵住了。
Xiàshuǐdào bèi dǔ zhù le.
The drain is blocked.
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