Look sharp
The phrase "Look sharp" is an idiomatic expression that is used as a command or suggestion to someone, instructing them to pay attention, be alert, act quickly, or make oneself presentable, usually in a well-dressed or stylish manner. It can also imply being observant or prepared for something important or urgent.
English is confusing! Why do people say "Pardon my French" when they are speaking English? Because of idioms!
An idiom is a phrase or expression that usually presents a figurative, non-literal meaning attached to the phrase. Does that sound fun? It can be!
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