wait for the other shoe to drop

/W EY1 T F AO0 R DH AH0 DH ER0 SH UW0 T UW0 D R AA0 P/
verb
  1. 1

    To defer action or decision until another matter is finished or resolved.

  2. 2

    To await a seemingly inevitable event, especially one that is not desirable.

Source: https://en.wiktionary.org/wiki/wait%20for%20the%20other%20shoe%20to%20drop