Conjoin (4)
I believe the answer is:
abut
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">conjoin</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for abut that I've seen before include "Adjoin, border" , "Meet" , "Cease (from activity)" , "Of building or land, end or lean against" , "Neighbour" .)