Darts line (4)

I believe the answer is:
oche
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">darts line</span>' is the definition.<br/ >'<span class="explanation-format__answer">oche</span>' can be an answer for '<span class="explanation-format__original">line</span>' <span class="explanation-format__explanation">(I've seen this before)</span>. I also know that 'darts' relates to this answer.<br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for oche that I've seen before include "Heavy African knife" , "The mark at darts" , "Missile launchers stand behind this" , "Line from which a dart player throws" , "Line from which dart-players throw" .)