The sound made by knocking on a door with a hard object (such as a door knocker). / The sound made by firing an automatic machine gun.

Such a sound.

A series of short, sharp taps, especially made by knocking on a door, beating a drum, or firing an automatic weapon

A series of short, sharp taps, especially made by knocking on a door, beating a drum, or firing an automatic weapon

The black rat.

A rat that lives in the Himalayas and southeast Asia; taxonomic name Rattus nitidus.

A rodent species of the Khammouan region of Laos, Laonastes aenigmamus

(idiomatic, vulgar, British spelling) To care a minimum amount; to have or show minimal interest

US standard spelling of give a rat's arse.

A burrowing rodent (Heterocephalus glaber), native to parts of East Africa.