Ebb and flow
From open-dictionary.com - the free dictionary.
English
Noun Phrase
- the flowing out and in of the tide
- (figurative) a large flowing out and in
Quotations
- 1595?: The sea will ebb and flow, heaven show his face — William Shakespeare, Love's Labour's Lost, 1595
- 2001: I want to hear the roaring ebb and flow of Broadway — The New Yorker Online 29 Oct 2001