Related topics: Oceanography
1 [singular] also ebb tideHEO
the flow of the sea away from the shore, when the tide goes out [≠ flood tide]
to be in a bad state or condition:
His confidence is at a low ebb.
a situation or state in which something increases and decreases in a kind of pattern:
the ebb and flow of the conversation
the ebb and flow of passengers in the station