be waiting for the other shoe to drop

be waiting for the other shoe to drop

AMERICAN, INFORMAL
If you are waiting for the other shoe to drop, one very bad thing has already happened and you are expecting another bad thing to happen soon. People are already on edge, and they're waiting for the other shoe to drop. Note: The idea in this expression is that you almost never hear only one footstep; another usually follows.
See also: drop, other, shoe, waiting