late 15c., santren "to muse, be in reverie," of uncertain origin. Meaning "walk with a leisurely gait" is from 1660s, and may be a different word entirely. Some suggest this word derives via Anglo-Fr. sauntrer (mid-14c.) from Fr. s'aventurer "to take risks," but OED finds this "unlikely." The noun meaning "a leisurely stroll" is recorded from 1828. Related: Sauntered.