expendable
US /ɪkˈspen.də.bəl/
UK /ɪkˈspen.də.bəl/
1.
of little significance when compared to an overall purpose, and therefore able to be abandoned or sacrificed.
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In war, human lives are often considered expendable.
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The old equipment was expendable once the new system was installed.
1.
a person or thing that is considered to be of little importance and can be sacrificed.
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The general viewed his soldiers as mere expendables in his grand strategy.
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In the movie, the minor characters were treated as expendables to advance the plot.