1610s, from Scottish and/or nautical variant of strope "loop or strap on a harness" (mid-14c.), probably from Old French estrop "strap," from Latin stroppus "strap, band," perhaps from Etruscan, ultimately from Greek strophos "twisted band," from strephein "to turn" (see strophe). Old English stropp, Dutch strop "halter" also are borrowed from Latin.
strap (strāp)
n.
A strip or piece of adhesive plaster. v. strapped, strap·ping, straps
To support or bind a part, especially with overlapping strips of adhesive plaster.