noun
a weight or force that balances or offsets another
verb
to have an equal and opposite effect on something
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The weights on each side of the scale act as a counterbalance to ensure accurate measurements.
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Adding more veggies to your plate can counterbalance all those carbs you've been eating.
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Dude, you gotta counterbalance all that junk food with some exercise.
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His sense of humor always serves as a counterbalance to her serious nature.