︎lake lettuce
n.— «Some might refer to them as moss, pond scum or lake lettuce, which encompasses a wide array of aquatic growth.» —“Weed control curtails two fishing trips” by Steve Ford Courier & Press (Evansville, Illinois) May 4, 2008. (source: Double-Tongued Dictionary)
Further reading
Cat hair may be something you brush off, but cat hair is also a slang term that means “money.” In the same way, cat beer isn’t alcoholic — some people use cat beer as a joking term for “milk.” And imagine walking on a...
How are lakes named? Does the proper name of a lake come first, as in Candlewood Lake, or does the word Lake precede the proper name, as in Lake Erie. It’s a question that’s long puzzled limnologists, the people who study lakes. The...