Definitions
1.NounA tool used to squeeze caliper brakes against the rim of a wheel, as on a bicycle, thereby allowing adjustments to the brake cable.
2.NounA source two steps removed from direct communication.
3.AdjectiveHaving been relayed by two intermediate sources."I heard the story from someone who got it from the horse's mouth. You're getting it third hand."
4.AdjectiveNot new, having more than one previous owner.