rip current
noun [ C ] uk/ˈrɪp ˌkʌr.ənt/ us/ˈrɪp ˌkɝː.ənt/
离岸流，退潮流
a fast-flowing area of water that can pull people or objects away from the land
Swimmers should be aware of the sometimes deadly coastal phenomenon of rip currents. 游泳者应注意沿海地区有时会出现致命的离岸流现象。
Compare: riptide