One who tumbles; one who plays tricks by various motions of the body. • A movable obstruction in a lock, consisting of a lever, latch, wheel, slide, or the like, which must be adjusted to a particular position by a key or other means before the bolt can be thrown in locking or unlocking. • A device for smoothing and polishing rough objects that are placed inside its rotating chamber. • A piece attached to, or forming part of, the hammer of a gunlock, upon which the mainspring acts and in which are the notches for sear point to enter. • A drinking glass that has no stem, foot, or handle — so called because such glasses originally had a pointed or convex base and could not be set down without spilling. This compelled the drinker to finish their measure. • A variety of the domestic pigeon remarkable for its habit of tumbling, or turning somersaults, during its flight. • A beverage cup, typically made of stainless steel, that is broad at the top and narrow at the bottom commonly used in India. • Something that causes something else to tumble. • A dog of a breed that tumbles when pursuing game, formerly used in hunting rabbits. • A kind of cart; a tumbril. • The pupa of a mosquito. • One of a set of levers from which the heddles hang in some looms. • A porpoise. • A service that mixes potentially identifiable or 'tainted' cryptocurrency funds with others, so as to obscure the audit trail; used for money laundering.