noun
a practice in which people search through commercial or residential trash to find items that have been discarded and that may be useful or valuable
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The practice of dumpster diving involves searching through waste containers for discarded items.
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I heard some people in the neighborhood have been dumpster diving for furniture.
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Let's go dumpster diving behind the grocery store and see what we can find.
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Sometimes you have to do a bit of dumpster diving to find the hidden gems in a large amount of information.