ticktock
1. [ verb ] make a sound like a clock or a timer
Synonyms: tick ticktack beat
Examples:

"the clocks were ticking" "the grandfather clock beat midnight"

Related terms: go watch tick beat
2. [ noun ] steady recurrent ticking sound as made by a clock
Synonyms: tictac tocktact
Related terms: tick tick
Similar spelling:   ticktack
  ticktacktoo
  ticktacktoe