A referee's whistle signaling the start, end, or a foul in a soccer game. It can also refer to a privileged piece of information or a timely warning.

Someone completely crazy, unpredictable, and lacking self-control, used across the Spanish-speaking world

To pass the buck, to dodge responsibility by pushing it onto someone else. Like tossing a ball to the next person so you do not have to deal with it. Common in Argentina and Uruguay when talking about people who avoid taking ownership of a problem.

An eye for an eye: the principle of taking revenge that exactly matches the harm received. In everyday Spanish it is used to justify payback and getting even, and is the foundation of the idea that justice means suffering equal consequences.