c. 1400, loupen, "to draw (a leash through a ring)," from loop (n.). Sense of "form into a loop or loops" (transitive) is from 1832; transitive meaning "form (something) into loops" is from 1856. Related: Looped (1934 in the slang sense "drunk"); looping. Loop the loop (1900) originally was in reference to roller-coasters at amusement parks.
"Loop-the-Loop" is the name of a new entertainment which goes further in the way of tempting Providence than anything yet invented. The "Loop" is an immense circle of track in the air. A car on a mimic railway shoots down a very steep incline, and is impelled around the inner side of this loop. ... The authorities at Coney Island are said to have prohibited "looping-the-loop" because women break their corset strings in their efforts to catch their breath as they sweep down the incline, and moreover, a young man is reported to have ruptured a blood vessel in his liver. ["Philadelphia Medical Journal," Aug. 10, 1901]
type of fastening for clothing, 1719, originally a belt loop for carrying a weapon, of unknown origin; perhaps from Portuguese froco, from Latin floccus "tuft of wool," a word of unknown etymology.
"loop formed by fastening a running knot or slip-knot," mid-15c., perhaps from Old French nos or cognate Old Provençal nous "knot," from Latin nodus "knot" (from PIE root *ned- "to bind, tie"). Rare before c. 1600.