Crossword Genius

Intensify (4,2)

Ross

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">intensify</span>' is the definition.<br/ ><span class="explanation-format__explanation">(heating up is a kind of intensifying)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for heat up that I've seen before include "Warm through" , "Make more intense" .)

I've seen this clue in the Universal.
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