1. Extremely exhausted
   "the day's shopping left her zonked";
   - knackered [Brit, informal], drained, shagged [Brit, informal], zonked out [informal], deadbeat [Brit, informal], shagged out [Brit, informal], stonkered [Brit, Austral, NZ, informal], shattered [Brit, informal], exhausted, dog-tired [informal], fagged [Brit, informal], fatigued, played out, spent, washed-out, worn-out, worn out, gone, shot [informal], pooped [N. Amer, informal], fried [N. Amer, informal], run-down
    
2. Nearly unconscious from alcohol or drugs
   "After the party, he was completely zonked out on the couch";
   - zonked out [informal]

1. Fall asleep fast, as when one is extremely tired
   "after the long drive, we zonked out and slept for 10 hours";
   - zonk out [informal]
    
2. Lose consciousness due to a sudden trauma, for example
   "He zonked out from exhaustion after the long hike"; "The patient zonked from the strong medication";
   - zonk out [informal], pass out, black out

See also: tired

Type of: change state, dope off [informal], doze off, drift off, drop off, drowse off, fall asleep, flake out [informal], nod off [informal], turn

Encyclopedia: Zonked