backbone
noun
The spinal column or spine: This is the most literal meaning of the word, and it refers to the long, curved bone structure that runs down the back of the body and supports the spinal cord.
The main or most important part of something: This figurative meaning of the word is often used to describe something that is essential or crucial to the success of something else.
Strength of character or courage: This figurative meaning of the word is often used to describe someone who is brave or determined.
Example
- The doctor took an X-ray of the patient's backbone to check for any fractures.
- The small business is the backbone of the local economy.
- She showed great backbone in standing up to the bully.