Crossword Genius

Make sense, with "up" (3)

Ross

I believe the answer is:

add

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make sense with up</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for add that I've seen before include "Put together - append" , "Include" , "Reason for difficulty learning" , "Also" , "Go further" .)

I've seen this clue in The New York Times, the USA Today and the Universal.
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