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tank2
1 [intransitive] to decrease quickly or be very unsuccessful : 
Not long after the chairman resigned, shares in the company tanked.
Not long after the chairman resigned, shares in the company tanked.2 [intransitive] British English informal to travel very fast in a car or vehicle
3 [intransitive] informal to fail badly and be very unsuccessful : His last film tanked in the States, but did well in the UK.
His last film tanked in the States, but did well in the UK.4 also tank it [transitive] to deliberately lose a sports game that you could have won
tank up
phrasal verb especially American EnglishTTC to put petrol in your car so that the tank is full
