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Backbone

Back

Back

Part of your body from your shoulders to your bottom.

Bone

bone

The hard parts inside a human or animal that make up its frame.

!Note - Fall is also American English for autumn.

back + bone

Backbone

backbone

The line of bones down the centre of the back, that support the body. (aka - vertebrae spine or spinal column)

Example Sentence:-

"The neck bone's connected to the backbone."

!Note - Backbone can be used idiomatically, and it can also refer to the part of a network that connects other networks together: "the backbone is the part of a communication network that carries the heaviest traffic"

(Ref: wordnetweb.princeton.edu/perl/webwn)