old boot—(UK sl.) said of an objectionable, aging, unattractive woman:
- She was a tough old boot and survived the hip replacement surgery, but had to go to a nursing home.
old shoe—
1. said of smth. regarded as outdated or useless:
- Love should not become an old shoe, it should never wear out or grow old.
2. is used of anything comfortable and familiar:
- Despite a brief anxiety attack, Jane settled into the job quickly, and soon it was as comfortable as an old shoe.