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z's

or Z's

[zeez]
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noun (used with a plural verb) Slang.
  1. sleep (often used with grab, catch, etc.): to grab some z's before dinner.
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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.
  1. the 26th letter of the English alphabet, a consonant.
  2. any spoken sound represented by the letter Z or z, as in zero, zigzag, or buzzer.
  3. something having the shape of a Z.
  4. a written or printed representation of the letter Z or z.
  5. a device, as a printer's type, for reproducing the letter Z or z.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018