ebb

• n.
  • a gradual decline (in size or strength or power or number)

    同义词： ebbing wane

  • the outward flow of the tide

    同义词： reflux

• v.
  • flow back or recede

    "the tides ebbed at noon"

    同义词： ebb away ebb down ebb out ebb off

  • hem in fish with stakes and nets so as to prevent them from going back into the sea with the ebb
  • fall away or decline

    "The patient's strength ebbed away"

以上来源于: WordNet