thumper

1. (slang) A single-cylinder engine, especially four-stroke engines or those with large engine displacements.countableslanguncountable

2. (uncountable) A drinking game wherein players must remember personal hand signs while being distracted by others banging on a table.uncountable

3. (slang) Something big, such as a lie; a whopper.countableslanguncountable

4. (UK, rail transport, slang) A kind of slam-door train introduced in the late 1950s.UKcountableslanguncountable

5. (US, military, slang) The Vietnam-era M79 grenade launcher (due to its distinctive report).UScountableslanguncountable

6. (Antarctica) A short rope for beating disobedient sled dogs.Examples: "This [argument] was about the use of the thumper to control dog teams, and perhaps the unique living conditions of a polar base caused both sides to shift from an initial disagreement to positions more extreme than the ones they would have reached in the wider world outside."countableuncountable