WordWeb Online

1. A buzzing or whizzing sound
   "a nasty zizz in the engine"
    
2. Sleeping for a short period of time (usually not in bed)
   "Arthur's taking a short zizz";
   - nap, catnap, light sleep, short sleep, forty winks [informal], snooze

1. Have a short sleep, esp. during the day
   - nap, catnap, catch a wink [informal], kip [Brit, informal], snooze, drowse, doze

Derived forms: zizzing, zizzed, zizzes

Type of: catch some Z's [N. Amer, informal], sleep, sleeping, slumber, sound

Encyclopedia: Zizz