Definition of expendable adjective from the Oxford Advanced Learner's Dictionary

 

expendable

 adjective
adjective
BrE BrE//ɪkˈspendəbl//
 
; NAmE NAmE//ɪkˈspendəbl//
 
(formal)
 
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if you consider people or things to be expendable, you think that you can get rid of them when they are no longer needed, or think it is acceptable if they are killed or destroyed synonym dispensable Soldiers in the ordinary ranks were considered expendable. It is a sad moment when you realize you are expendable in your job.
See the Oxford Advanced American Dictionary entry: expendable