noun
a pipe or channel that carries away waste water or sewage
verb
to cause the water or other liquid in something to run out, leaving it empty or dry
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The plumber unclogged the drain in the kitchen sink.
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I need to clean out the drain in the shower, it's clogged again.
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I can't believe you drank all my soda, you really know how to drain it!
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The constant demands of his job were starting to drain his energy.