Englishfor English speakers
holdback
noun
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restraint (act or result of holding back, device that restrains)
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The projection or loop, on the thill of a vehicle, to which a strap of the harness is attached, to hold back a carriage when going downhill, or in backing.
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[[restraint]]
sprocket
Noun
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The tooth on a wheel; it goes with a chain or other band with holes.