'riptide' definitions:

Definition of 'riptide'

From: WordNet
noun
A stretch of turbulent water in a river or the sea caused by one current flowing into or across another current [syn: rip, riptide, tide rip, crosscurrent, countercurrent]
noun
A strong surface current flowing outwards from a shore [syn: riptide, rip current]

Synonyms of 'riptide'

From: Moby Thesaurus