Cos'è swamp? Cos'è swamp? A seasonally flooded bottomland with more woody plants than a marsh and better drainage than a bog.A lowland region saturated with water.A situation or place fraught with difficulties and imponderables: a financial swamp. To drench in or cover with or as if with water.To inundate or burden; overwhelm: She was swamped with work. Nautical To fill (a ship or boat) with water to the point of sinking it.To become full of water or sink.