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tank

verb [I]
 
 
/tæŋk/ informal

Definition

to go down in price, value, etc., or to become less successful: The state was expecting an increase in tax revenues, but that was before the economy tanked. Car exports in the year to April tanked 23 percent.Becoming and making smaller or lessBecoming and making less strong
(Definition of tank verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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