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How to sign: the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
"the fall broke his back";

Similiar / Same: spinal column, vertebral column, spine, rachis, backbone

Categories: skeletal structure

Within this category: chine, notochord

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How to sign: place a bet on
"Which horse are you backing?"; "I'm betting on the new horse";

Similiar / Same: bet on, gage, game, stake, punt

Categories: bet, play, wager

Within this category: ante, parlay

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How to sign: in or to or toward a former location
"she went back to her parents' house";