6 idioms share this illustration Be terrified (간담이 내려앉다) Be greatly startled. be terribly startled (간담이 떨어지다) To be terribly startled. Be badly startled (간이 떨어지다) Be greatly startled. be shocked (눈깔이 나오다) A coarse expression for being greatly startled. have one’s eyes pop (눈알이 나오다) To be greatly startled. have one’s eyes pop in surprise (눈이 나오다) To be greatly startled.