fluctuate
/ˈflʌkt͡ʃu.eɪt/verb
To rise and fall or change repeatedly in an irregular way.
Example sentences
- “Gas prices fluctuate from week to week.”
- “Temperatures in the desert fluctuate wildly between day and night.”
Standard for prices, temperatures, moods, and weight. It implies movement both up and down; if the change runs one way, use 'rise' or 'decline' instead.