What's the difference between i.e. and e.g.?
"move rapidly," 1852, of echoic origin. Related: Zipped; zipping. Zip gun "homemade pistol" first recorded 1950.
"to close or fasten by means of a zipper," 1932, back-formation from zipper. Related: Zipped; zipping.
"zero," 1900, student slang for a grade of zero on a test, etc.; of unknown origin; cf. zilch.
1963, in U.S. postal ZIP code, an acronym for Zone Improvement Plan, no doubt chosen with conscious echo of zip (v.1).
[1900+ Students; like zilch, probably coined from a familiar word beginning with z]
[1900+; echoic of the sound of something swishing rapidly through the air, giving an impression of force, and also of the tearing of cloth; such a use is attested fr 1875]
A Vietnamese; dink
[Vietnam War; said to be fr zero intelligence]