A broad-mouthed, loose-ringed bit (metal in a horse's mouth). It brings pressure to bear on the tongue and bars and corners of the mouth. Often used as a training bit.
Apparently from Dutch snavel, from Middle Dutch snavel, snabel, diminutive of Middle Dutch snabbe, snebbe. Akin to Old Frisian snavel ("mouth"), Middle Low German snabbe, Old English nebb. More at neb.
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