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0 the line of bones down the centre of the back that provides support for the body:
1 the most important part of something, providing support for everything else:
Farming is the backbone of the country's economy.
[ + to infinitive ] Will he have the backbone to tell them what he thinks?
3 the part of something that provides strength and support:
Newcomers are now the backbone of this team.
6 the system of equipment and connections that allows communication at high speeds over long distances: