Proto-Germanic: *dirba-, *dirban-, *darbia-, *dirbian- vb.
Meaning: work; srong, adroit
Old Norse: djarf-r `kühn, mutig'; dirfa wk. `erdreisten'
Norwegian: djerv adj.; djerva-sy vb.
Swedish: djärv `dreist'; djärva-st vb.
Old Danish: djärve-s, dürve-s `sich erdreisten'
Danish: djerv adj.
Old English: ge-deorfan st. V. `arbeiten; umkommen', gedeorf, deorf n. `Arbeit, Mühsal'
Old Frisian: derve `derb, geradezu'
Old Saxon: dervi `kräftig, frech, feindlich'
Middle Low German: derve `geradezu'
