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Huff-Duff

[huhf-duhf] /ˈhʌfˌdʌf/
noun
1.
a method used by the Allies in World War II for locating enemy submarines and other naval or land targets through simultaneous bearings on their radio transmissions.
Origin
vocalization of the abbreviation h.f.d.f. for high-frequency direction finder
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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