Old English sundrian, syndrian "to sunder, separate, divide," from sundor "separately, apart," from Proto-Germanic *sunder (cognates: Old Norse sundr, Old Frisian sunder, Old High German suntar "aside, apart;" German sondern "to separate"), from PIE root *sene- "apart, separated" (cognates: Sanskrit sanutar "far away," Avestan hanare "without," Greek ater "without," Latin sine "without," Old Church Slavonic svene "without," Old Irish sain "different"). Related: Sundered; sundering.