To be caught red-handed in the act of doing something wrong. The Spanish equivalent of being caught with your hand in the cookie jar — no plausible denial possible.

In Spain and Latin America, to throw yourself into something courageous — to face a challenge head on without hesitation. Named after the bullfight ring, where courage is life or death.

To be a sharp one — clever, crafty and street-smart, someone who navigates tricky situations with ease. In Spain a bicho knows all the angles and uses them.

To be hardheaded — stubborn, slow to understand, or unable to learn from mistakes. Someone with a hard head repeats the same error a thousand times and still won't change.