grey-wave

grey-wave

or

gray-wave

adj
(Banking & Finance) informal denoting a company or an investment that is potentially profitable but is unlikely to fulfil expectations before the investor has grey hair
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014