"rejected matter, that which is vile or despised," 1520s; literally "that which is scoured off;" from off (prep.) + verbal noun from scour (v.1) "cleanse by hard rubbing."
off-peak
off-putting
off-ramp
off-rhyme
off-road
off-scouring
off-season
offset
offshoot
off-shore
offshoring
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