little of what you fancy does you good
The phrase "little of what you fancy does you good" means that indulging in your desires or pleasurable activities in moderation can be enjoyable and beneficial for your well-being. It suggests that occasionally indulging in small pleasures or treats can bring joy and improve your overall happiness or satisfaction, as long as it is done in moderation and does not become excessive or harmful.
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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