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English definition of “drain”

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drain

verb
 
 
/dreɪn/
[T] to reduce or remove a large amount of something: drain sth from sth The government is enforcing a deal that allows it to drain billions from miners' pension schemes.drain reserves/resources They took on work that was not profitable, draining cash resources.
[I] to disappear gradually: How can we make sure business does not drain out of the country? The riches lured in too much competition and profits are now beginning to drain away.
(Definition of drain verb from the Cambridge Business English Dictionary © Cambridge University Press)
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