Ticking
From Tardis Wiki, the free Doctor Who reference
Ticking was a noise which was created by a clock.
History[[edit]]
The Mysterious Ticking Noise was an instalment in The Potter Puppet Pals which featured a pipe bomb, creating the eponymous "ticking noise". (TV: Chute! Episode 9)
While reflecting on her 24 hours left to find the Doctor, Doom stated that "the [clock was] ticking". (WC: Meet Doom - the Universe's Greatest Assassin!)