typewriter

Short definition from Wiktionary

Noun

1. 1
   A device, at least partially mechanical, used to print text by pressing keys that cause type to be impressed through an inked ribbon onto paper.
2. 2
   One who uses a typewriter; a typist.
3. 3
   A machine gun or submachine gun (from the noise it makes when firing).
4. 4
   A prank in which fingers are jabbed roughly onto someone's chest followed by striking them over the ear in imitation of using an old-fashioned typewriter.