pond scum
"Pond scum" can refer to both a biological phenomenon and a derogatory term used in informal speech.
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Definition
B2Biology
(scientific, environmental)A layer of algae or microorganisms that forms on the surface of a still body of water.
Example
- The pond scum was so thick that it covered the entire surface of the water.
- Pond scum can provide food and shelter for aquatic life, but too much can harm the ecosystem.
C1Informal Speech
(derogatory, informal)A term used to describe someone considered to be morally low or despicable.
Example
- He called his dishonest colleague pond scum.
- She felt like pond scum after betraying her friend's trust.
Similar
Terms that have similar or relatively close meanings to "pond scum":