Old English sorg "grief, regret, trouble, care, pain, anxiety," from Proto-Germanic *sorg- (source also of Old Saxon sorga, Old Norse sorg, Middle Dutch sorghe, Dutch zorg, Old High German soraga, German sorge, Gothic saurga), perhaps from PIE *swergh- "to worry, be sick" (source also of Sanskrit surksati "cares for," Lithuanian sergu, sirgti "to be sick," Old Church Slavonic sraga "sickness," Old Irish serg "sickness"). Not connected etymologically with sore (adj.) or sorry.
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