riptide

Noun	1.	riptide - a stretch of turbulent water in a river or the sea caused by one current flowing into or across another current Synonyms: countercurrent, crosscurrent, tide rip, rip
	2.	riptide - a strong surface current flowing outwards from a shore Synonyms: rip current

countercurrent, crosscurrent, rip, tide rip, turbulence, turbulency