corridor of uncertainty

noun

cricket an area of a wicket just outside a batsman's off stump, so located that the batsman will have difficulty in deciding whether or not to play a ball bowled into it
soccer an area of the pitch between the defenders and the goalkeeper, in which it is not clear who should take the responsibility of dealing with a ball played into it
any situation in which the right course of action is not clear
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012