From Portuguese tanque ("tank, liquid container"), originally from Indian vernacular for a large artificial water reservoir, cistern, pool, etc., for example, Gujarati ટાંકી or Marathi टाकी. Compare the Arabic verb اِسْتَنْقَعَ.
In the sense of armoured vehicle, prototypes were described as tanks for carrying water to disguise their nature as well as due to physical resemblance.
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