Ebb and flow
When something moves first in one direction, then in another, it "ebbs and flows"
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In today’s episode, you’ll hear that relations between North and South Korea have ebbed and flowed throughout the years. This means they have gone from being good to being bad. When something ebbs and flows, it means it goes first in one direction, then in another. A sports star’s performance can ebb and flow, if he goes from being good to bad to good again. Politics can ebb and flow, as one party is popular, then the other, and back again.