graded adjective & adjective If you regard someone or something as expendable, you think it is acceptable to get rid of them, abandon them, or allow them to be destroyed when they are no longer needed. [formal] ⇒ Once our services cease to be useful to them, we're expendable. ⇒ During the recession, training budgets were seen as an expendable luxury. ⇒ ...an expendable rocket.
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