To restore energy or power to something, or to regain your own physical or mental energy by resting.
From 're-' (again) plus 'charge' (from Old French 'charger,' to load or fill). Literally means 'to charge again,' and applies both to batteries and human exhaustion.
Your brain actually needs downtime to recharge—when you rest, your brain's 'default mode network' activates and consolidates memories, which is why you often get your best ideas after sleeping!
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