z's

or Z's

[zeez]

noun (used with a plural verb) Slang.

sleep (often used with grab, catch, etc.): to grab some z's before dinner.

Origin of z's

First recorded in 1960–65; from the conventional use of a series of z's to represent snoring

Z, z

[zee or, esp. British, zed; Archaic iz-erd]

noun, plural Z's or Zs, z's or zs.

the 26th letter of the English alphabet, a consonant.
any spoken sound represented by the letter Z or z, as in zero, zigzag, or buzzer.
something having the shape of a Z.
a written or printed representation of the letter Z or z.
a device, as a printer's type, for reproducing the letter Z or z.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019