Take care when swimming here, as there's a strong year-round undertow.
Powerful waves and strong undertows can cause serious injury or death if proper attention is not paid to safety.
Please be aware that there is a strong undertow and current just of the beach.
The river, with its strong undertow, would be ideal for disposal of an unwanted body.
Several people drown each year because of the rough surf and strong undertow.
Can a rip tide be accompanied by a strong undertow?
I was well aware of the strong undertow of hostility moving towards me.
There can be strong undertows when the surf is high.
From opposite ends of the room both he and she get pulled into the crowd like a strong undertow.
We wandered down to the water, which was bathtub warm but had a strong undertow.