cat burglar
A "cat burglar" refers to a person who specializes in committing thefts, typically burglaries, with a high level of skill, stealth, and agility. The term is rooted in the idea that these individuals possess the agility and grace of a cat in navigating through complex or secure environments to carry out their illicit activities.
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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