bolta ,bolt from the 'blue1.■an event or a piece of news which is sudden and unexpected; a complete surprise 突如其来的事件﹙或消息﹚；晴天霹雳:She had given us no warning she was going to leave; it came as a complete bolt from the blue. 她预先没告诉我们她要走了，这真是太突然了。2.■ORIGIN This idiom refers to a bolt of lightning from a clear sky. 这个习语原指晴天打的霹雳。bolt 'upright3.■with your back very straight in an upright position笔直地；直挺挺地:The noise woke her suddenly and she sat bolt upright in bed. 吵闹声把她突然惊醒，她直挺挺地从床上坐了起来。make a 'bolt/'dash for it/sth (informal)4.■try to escape or get somewhere quickly 迅速逃跑；熘走:The prisoners made a bolt for it through an open window. 囚犯从一扇敞开的窗户逃跑了。We smelt smoke and made a dash for the door.我们闻到了烟味，迅速冲向门口。5.■shoot your bolt 另见shoot