seesaw

US /ˈsiː.sɑː/
UK /ˈsiː.sɑː/
"seesaw" picture
1.

a long plank balanced on a fixed support, on which two children sit at opposite ends and move up and down by pushing off the ground with their feet

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The children laughed as they played on the seesaw.
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We need to fix the broken seesaw in the park.
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teeter-totter
1.

to move up and down on a seesaw

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They spent the afternoon seesawing in the playground.
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The boat began to seesaw wildly in the storm.
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teeterwobblefluctuate
2.

to alternate between two states or positions

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His emotions seesawed between hope and despair.
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The stock market continued to seesaw throughout the day.
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fluctuateoscillatewavervacillate