This refers to the fluctuations or changes in circumstances, often in a person's life or experiences, indicating that there are both good times and bad times.

This describes a physical motion where something is moving up and down in a playful or light manner, often associated with buoyancy.

This expression typically relates to changes in levels or status of something, such as prices, emotions, or physical objects.

This phrase suggests a cyclical pattern of change in intensity or quantity, as seen in tides or trends over time.