示警shìjǐng用某种动作或信号使人注意(危险或紧急情况){give a warning; warn; alert to danger; make people aware of (a danger or emergency) by making some movement or giving some signal}: 鸣锣～{give a warning by striking a gong; sound an alarm with a gong}|举红灯～。{raise an alarm by holding up a red light}