Give an example of a cultural idiom or collocation and explain its meaning.

Give an example of a cultural idiom or collocation and explain its meaning.

One example of a cultural idiom is "break a leg" in the theater industry. This idiom is used to wish someone good luck before a performance. However, its literal meaning is the opposite, as breaking a leg is considered an unfortunate event. The origin of this idiom is unclear, but it is believed to have originated from the superstition that wishing someone good luck directly would bring bad luck. Therefore, by saying "break a leg," it is believed to bring good luck instead.