Meaning

originFrom Middle English dernen, dærnen, from Old English dyrnan, diernan (“to keep secret, conceal, hide, restrain, repress, hide oneself”), from Proto-West Germanic *darnijan (“to conceal”), from *darnī (“hidden, secret”). Cognate with Old Saxon dernian (“to conceal”), German tarnen (“to camouflage, disguise”). See also darn, tarnish.

Etymology from Wiktionary, CC BY-SA 3.0