The word "nerodia" refers to a type of water snake found in North America. These snakes are part of the family Colubridae and are known for living in or around water bodies like rivers, lakes, and swamps.
"I saw a nerodia swimming gracefully in the lake during my hike."
In more advanced discussions, you might encounter terms like "Nerodia sipedon," which is the scientific name for the common water snake. You might say, "The Nerodia sipedon is often mistaken for the venomous water moccasin."
"Nerodia" specifically refers to these water snakes and does not have other meanings in English.
There are no common idioms or phrasal verbs specifically related to "nerodia," but you might hear phrases like "swimming with the fishes," which can metaphorically refer to being in a difficult situation, though it's not directly related.