From Middle English los, from Old English los ("damage, destruction, loss"), from Proto-Germanic *lusÄ… ("dissolution, break-up, loss"), from Proto-Indo-European *lews- ("to cut, sunder, separate, loose, lose"). Cognate with Icelandic los ("dissolution, looseness, break-up"), Old English lor, forlor, Middle High German verlor ("loss, ruin"). More at lose.