Rid
Middle English: from Old Norse rythja . The original sense ‘to clear’ described clearing land of trees and undergrowth; this gave rise to ‘free from rubbish or encumbrances’, later becoming generalized.
wiktionary
Fusion of Middle English redden(“to deliver from, rid, clear”) (from Old English hreddan(“to deliver, rescue, free from, take away”), from Proto-West Germanic *hraddjan, from Proto-Germanic *hradjaną(“to save, deliver”)) and Middle English ridden(“to clear away, remove obstructions”) (from Old English ġeryddan(“to clear land”), from Proto-Germanic *riudijaną(“to clear”), from Proto-Indo-European *rewdʰ-(“to clear land”).
Akin to Old Frisian hredda(“to save”), Dutch redden(“to save, deliver”), German retten(“to save, deliver”), roden(“to clear”) and reuten(“to clear”), Old Norse ryðja(“to clear, empty”), Old Norse hrōðja(“to clear, strip”). More at redd.
rid
etymonline
rid (v.)
c. 1200, ridden, "clear (a space); set free, save," from Old English *ryddan (past participle geryd) or else from a Scandinavian source akin to Old Norse ryðja (past tense ruddi, past participle ruddr) "to clear (land) of obstructions," from Proto-Germanic *reudijan (source also of Old High German riuten, German reuten "to clear land," Old Frisian rothia "to clear," Old English -royd "clearing," common in northern place names), from PIE root *reudh- "to clear land."
Meaning "be rid of, be freed from" (something troublesome or useless) is from mid-15c. The general sense of "to make (someone or someplace) free (of someone or something else)" emerged by 16c. The senses have merged somewhat with those in Northern English, Scottish, and U.S. dialectal redd (q.v.). To get rid of (something or someone) is from 1660s. Related: Ridden; ridding.
