zathttp://www.oed.com/dictionary/zat_n%3Ftab%3Dmeaning_and_usezat, n.
First published 1986; not fully revised

zatnoun

colloquial.
  1. 1934–
    The cricket appeal ‘How's that?’ (see how adv., int.1, & n.3 Phrases P.5b).
    1. 1934
      Not a bad record..for a game that consists chiefly of standing about..and shouting ‘Zat?’ at intervals.
      Humorist 27 January 38/3
    2. 1966
      Outside the window a sharp yelp of ‘Zat?’ sounded.
      M. Woodhouse, Tree Frog xxiii. 167

zat, n. was first published in 1986; not fully revised.

zat, n. was last modified in July 2023.