Be up against
(Other definitions for oppose that I've seen before include "Act against" , "Resist; disapprove of" , "Resist, contend with" , "Obstruct, resist" , "Resist (someone)" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be up against</span>' is the definition.<br/ ><span class="explanation-format__explanation">(to neighbour something or go beside it)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for abut that I've seen before include "Adjoin, border" , "Adjoin at one end" , "Adjoin, press up against" , "Touch, lean on" , "Lean against the odd tuba" .)