The seesaw balanced precariously.
Meaning: The plank with seats on both ends was in an unstable equilibrium, teetering back and forth due to the children's movements.
Choice of Words: Seesaw is a long plank pivoted on a central support, with a seat at each end, on which children can play by pushing up and down to make the other end go up and down. Balanced means to be in a steady position, not leaning or falling. Precariously means in a way that is not stable or secure.
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Related Expressions