Noun

• S: (n) ebb, ebbing, wane (a gradual decline (in size or strength or power or number))
• S: (n) ebb, reflux (the outward flow of the tide)

Verb

• S: (v) ebb, ebb away, ebb down, ebb out, ebb off (flow back or recede) "the tides ebbed at noon"
• S: (v) ebb (hem in fish with stakes and nets so as to prevent them from going back into the sea with the ebb)
• direct hypernym / inherited hypernym / sister term
• sentence frame
• S: (v) ebb (fall away or decline) "The patient's strength ebbed away"