A particularly strong tidal current.
the tide while water is flowing out
A rip current which may carry a swimmer offshore (the term "riptide" used in this sense is a misnomer).
‘This beach suffers from a riptide that can easily sweep you out to sea.’;
Ebbtide is a 1994 Australian direct-to-video film
a stretch of turbulent water in a river or the sea caused by one current flowing into or across another current
a strong surface current flowing outwards from a shore