けいかいせん

けいかいせん【警戒線】

〔非常線〕 a police line [cordon]; 〔警戒水位〕 a warning water level; the warning line.

●警戒線を張る[敷く] form [set up, throw] a police line [cordon] 《around an area》

・警戒線を突破する break through a police cordon

・(水位が)警戒線を越える pass [go over, go above] the warning line.