Exhaust or tire (4,3)
I believe the answer is:
wear out
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">exhaust</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that exhaust is a more specific form of the action wear out)</span><br/ ><br/ >'<span class="explanation-format__original">tire</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that tire can be written as wear out)</span><br/ ><br/ ></span>
(Other definitions for wear out that I've seen before include "Use until no longer usable" , "Exhaust" , "Decay; tire utterly" , "Bring to end of useful life" , "Impair by use" .)