Webster's Revised Unabridged Dictionary · 1913

Zip

Zip (zip) , noun

[Imitative.]

1.
A hissing or sibilant sound such as that made by a flying bullet.
2.
a quantity of no importance. [informal]
3.
a device for locking together two toothed edges by means of a sliding tab.

Zip , intransitive verb

To make, or move with, a sound like a zip{1}.