If someone's life, support, or feeling ebbs, it becomes weaker and gradually disappears. Were there occasions when enthusiasm ebbed? Ebb away means the same as ebb. Their popular support is ebbing away
If someone or something is at a low ebb or at their lowest ebb, they are not being very successful or profitable. a time when everyone is tired and at a low ebb
The ebb or the ebb tide is one of the regular periods, usually two per day, when the sea gradually falls to a lower level as the tide moves away from the land. the spring ebb tide
the outward flow of the tide a gradual decline (in size or strength or power or number) fall away or decline; "The patient's strength ebbed away" hem in fish with stakes and nets so as to prevent them from going back into the sea with the ebb flow back or recede; "the tides ebbed at noon
You can use ebb and flow to describe the way that something repeatedly increases and decreases or rises and falls. the ebb and flow of feeling and moods