A "defensible position" refers to a location or stance that can be protected or defended when facing opposition or attack. It is a place or argument that is advantageous and offers protection against any threats or challenges. Full definition
Cameron and Alexander - and their party leaderships - occupy the same, perfectly defensible position: we may have a referendum in future, should our relationship with Europe change, but we should wait and see if that change comes about before holding any such referendum. (conservativehome.blogs.com)
Better still, an even more defensible position is staying out of the market entirely, holding cash as you wait patiently to strike at the right opportunity. (sovereignman.com)
Now he reviews a new book on ethics and writes,» [The author] agrees with what now seems to be a near - consensus among philosophers that «speciesism» - the view that we are entitled to take theinterests of animals less seriously than we take human interests, simply because humans are members of our species - is not a morally defensible position.» (faith.org.uk)