Tūm'bler, n.
Sense 1. One who tumbles; one who plays the tricks of a mountebank.
Sense 2. That part of a lock which detains the shot-bolt in its place, until a key lifts it and leaves the bolt at liberty.
Sense 3. A large drinking glass, without a foot or stem;—so called because originally it had a pointed or convex base, and could not be set down with any liquor in it, thus compelling the drinker to finish his measure.
Sense 4. A small variety of the domestic pigeon;—so called from its habit of tumbling or turning over in flight.
Sense 5. A sort of dog used for inveigling game;—so called from his habit of tumbling before he attacks his prey. Hudibras.
Sense 6. A kind of cart; a tumbrel. [Scot. and Prov. Eng.] W. Scott. Halliwell.