Crossword Genius

Share a boundary (4)

Ross

I believe the answer is:

abut

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">share a boundary</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 abut that I've seen before include "Touch (side of next building)" , "Adjoin at one end" , "Adjoin, press up against" , "Adjoin, be contiguous to" , "Lie next to" .)

I've seen this clue in The Guardian and the USA Today.
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