Huff-Duff
[ huhf-duhf ]
/ ˈhʌfˌdʌf /
noun
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 of Huff-Duff
vocalization of the abbreviation
h.f.d.f. for
high-frequency direction finder