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fluctuate (verb) change frequently from one extreme to the other.
Power supply fluctuates if it keeps changing frequently. When anything changes in size, amount, quality, etc., constantly, it fluctuates. 'It is unwise to invest when prices fluctuate.' This means that it is foolish to buy or sell when prices change frequently. A person's fortunes fluctuate if they have periods of wealth followed by spells of poverty.
- The stock market fluctuated wildly over the week. Investors were greatly confused as the market swung from a boom to a crash frequently.
- The weather was totally unpredictable with the temperature fluctuating between extremes of very low and very high, with some showers now and then.