rescue (n.) Look up rescue at Dictionary.com
late 14c., from rescue (v.). Earlier noun was rescous (early 14c.), from Old French rescous.
rescue (v.) Look up rescue at Dictionary.com
c.1300, from stem of Old French rescorre "protect, keep safe; free, deliver" (Modern French recourre), from re-, intensive prefix (see re-), + escourre "to cast off, discharge," from Latin excutere "to shake off, drive away," from ex- "out" (see ex-) + -cutere, combining form of quatere "to shake" (see quash). Related: Rescued; rescuing.