To reduce the supply or amount of something; to deplete or make less full.
From 'de-' (reduce) + 'plenish' (to fill, from Latin 'plenus' meaning full). This word blends a removal prefix with 'plenish' (an archaic word meaning to stock or fill), creating a formal verb.
This is basically a fancier, older version of 'deplete'—English had 'deplenish' first, then people simplified it to 'deplete,' showing how languages naturally trim down fancy words over time.
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