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spine

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spine/ˈspaɪn/noun
pluralspines
spine
/ˈspaɪn/
noun
pluralspines
Learner's definition of SPINE  
[count]  : the row of connected bones down the middle of the back : backbone
— see picture at human
[count]  : a sharp, pointed part on an animal or plant
[noncount]informal  : courage or strength of character
[count]  : the part of a book to which the pages are attached
◊ A book's spine often has the title and author's name printed on it.

up/down your spine

◊ If something sends a chill/shiver up/down your spine or if a chill/shiver runs up/down your spine, you become frightened, thrilled, etc.
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