Crutch (noun)

1. A support for the hand used to help a person walk when they have a problem with their legs.
2. A support used to help a person walk when they are injured or disabled.
3. Something that is relied on too much to support something else.

Origin:

From old english crutch, meaning a staff or support.

Examples:

1. He walked with a crutch because of his broken leg.
2. She used crutches after her surgery.
3. The company was using the new product as a crutch for their failing business.
4. The crutches helped him to get around after his injury.
5. The crutch helped him to stand up.