1. moved up and down or back and forth like a seesaw
2. changed repeatedly between two different conditions, opinions, or positions

Examples

• The stock price seesawed throughout the trading day.
• Her emotions seesawed between excitement and anxiety.
• The two teams seesawed back and forth in the lead.
• Public opinion seesawed on the controversial issue.
• The boat seesawed gently in the harbor waves.
• His weight seesawed up and down for months.
• The conversation seesawed between serious topics and jokes.