Baited Breath or Bated Breath - Both are interesting.

1.-
The Merchant of Venice:
Shakespeare
“Shall I bend low and, in a bondman’s key, / With bated breath and whisp’ring humbleness, / Say this ...”.
Bated breath refers to a state in which you almost stop breathing through terror, awe, extreme anticipation, or anxiety.

2.-
The Cruel Clever Cat
Poem by Geoffrey Taylor

Sally, having swallowed cheese,
Directs down holes the scented breeze,
Enticing thus with baited breath
Nice mice to an untimely death.

3.-
Mark Twain
Tom Sawyer: “Every eye fixed itself upon him; with parted lips and bated breath the audience hung upon his words, taking no note of time, rapt in the ghastly fascinations of the tale”.