General Cunning and Slyness:
* "As cunning as a fox": This is the most common and well-known idiom, meaning someone is very clever, shrewd, and able to outsmart others.
* "A fox in the henhouse": This refers to someone who is a threat or danger, especially in a situation where they shouldn't be. It implies a sly, sneaky individual who will take advantage.
* "To fox someone": To confuse or trick someone, usually by cunning or deception.
Other Idioms:
* "To be outfoxed": To be outsmarted or tricked.
* "A fox's sleep": A short, light nap, as foxes are known to sleep lightly.
* "A fox's tail": This can refer to something that is a giveaway or a telltale sign, often referring to a hidden secret.
* "To have a fox's head": This idiom is less common, but means to be very cunning and intelligent, with a strong ability to outsmart others.
Note: While foxes are often portrayed as cunning and sly, they are also known for their intelligence and adaptability.