Thump; party (4)
I believe the answer is:
bash
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">thump</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">party</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(term for a party or celebration)</span><br/ ><br/ ></span>
(Other definitions for bash that I've seen before include "Social event - clobber" , "Try - rave-up" , "Party; beat" , "knock" , "Criticise -- social gathering" .)