mind-boggled(george serebryakov); hung-up.on(alexs2011); hung-up about(alexs2011); stumped(be stumped by: be too hard for sb.; baffle (Oxford Dictionary): Staff from Just Clear, a waste firm, were clearing out a house in London when they discovered these incredible artefacts hidden beneath a stack of boxes. Mr O'Shea says that the team tried to search online for more information but were stumped until he reached out to a computer expert. (dailymail.co.uk)ART Vancouver)
