Leave well enough alone
The phrase "leave well enough alone" means to refrain from making unnecessary changes or interventions when something is already satisfactory or functioning adequately. It implies leaving things or situations as they are because further meddling or improvements may do more harm than good.
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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