spine
When referring to the body, "spine" is often used interchangeably with "backbone," though "spine" sounds slightly more medical. In a figurative sense, saying someone "has no spine" is a common way to describe them as weak or cowardly. This usage is informal and usually critical. When talking about books, the "spine" refers specifically to the outer edge of the binding, not the pages inside.
💬Casual Conversation
The board is eating us alive. Please tell me you'll back my proposal.
A river flows, Jessica. It doesn't need a spine to move forward.
Meanings
The series of vertebrae extending from the skull to the pelvis, forming the main support of the body.
"The doctor examined her spine for any signs of curvature."
A stiff projection or quill on an animal or plant, often sharp and used for protection.
"A hedgehog is covered in thousands of small spines."