What does the idiom swimming with sharks?

Swimming with sharks is an idiom that refers to being in a dangerous or difficult situation. It is often used figuratively to describe a situation in which someone is surrounded by dangerous or difficult people or circumstances. For example, someone might say that they are "swimming with sharks" if they are working in a competitive or cutthroat environment. The idiom can also be used literally to describe the act of swimming in a body of water that is known to be inhabited by sharks. In this case, the idiom is used to warn people of the potential danger of swimming in such waters.