an underground pipe that is used to carry sewage away from houses, factories, etc.污水管；下水道；阴沟- a sewer pipe/system下水道/系统
- an open sewer (= a channel on the surface of the ground that is used to carry sewage)排污明沟
Extra Examples- Much of the water runs away down the sewers.很多水从下水道流走。
- A network of sewer tunnels runs underneath the prison.下水道网络遍布监狱。
Topics Buildingsc1Oxford Collocations DictionarySewer is used before these nouns: See full entry Word OriginMiddle English (denoting a watercourse to drain marshy land): from Old Northern French seuwiere ‘channel to drain the overflow from a fish pond’, based on Latin ex- ‘out of’ + aqua ‘water’.