tumbler Definition

1a. A flat-bottomed drinking cup without a stem or handle, usually of glass or plastic;
1b. A tumblerful.
2. An acrobat, especially one who performs somersaults.
3. colloq
A tumble-dryer.
4. The part of a lock which holds the bolt in place until it is moved by a key.
5. The part of a firearm which is released by the trigger and forces the hammer forward.
6. A machine with a revolving drum in which gemstones are polished.

Form: tumbler-box (in full)