land that is always wet and often partly covered with water
例：I spent one whole night by a swamp behind the road listening to frogs.
to cover (something) with water
例：Huge waves swamped the vessel.
to cause (someone or something) to have to deal with a very large amount of things or people at the same time
【usually used as (be) swamped by/with sth】忙于某事;挤满了人
例：We’ve been swamped with phone calls since the advert appeared.