Crossword Genius

Impetus; boost (8)

Ross

I believe the answer is:

stimulus

<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">impetus</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">boost</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>

(Other definitions for stimulus that I've seen before include "Spur or catalyst for action" , "It evokes a reaction" , "Prod or incentive" , "Something provoking a response" , "Trigger" .)

I've seen this clue in the Sydney Morning Herald.
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