(informal)catch someone in an embarrassingly unprepared state
(非正式)在某人尴尬不备时逮个正着
(informal)rely on instinct rather than logic or knowledge
(非正式)凭直觉做事
(informal)make someone extremely scared, bored, etc.
(非正式)把某人吓得魂不附体(或使某人感到特别乏味)