undertide

English Thesaurus

1. a current below the surface of a fluid (noun.event)

hypernym	:	current, stream,
definition	:	a steady flow of a fluid (usually from natural causes) (noun.event)

hyponym	:	sea purse, sea puss, sea-poose, sea-purse, sea-puss, undertow,
definition	:	the seaward undercurrent created after waves have broken on the shore (noun.event)

part meronym	:	tide,
definition	:	the periodic rise and fall of the sea level under the gravitational pull of the moon (noun.event)