don't let the grass grow under your feet
The phrase "don't let the grass grow under your feet" means to not waste time or to not be idle. It encourages someone to take action promptly or to be diligent and productive in achieving their goals without delay.
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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