fluctuate
US /ˈflʌk.tʃu.eɪt/
UK /ˈflʌk.tʃu.eɪt/

1.
fluctuar, oscilar, variar
rise and fall irregularly in number or amount
:
•
The stock market prices fluctuate daily.
Los precios del mercado de valores fluctúan diariamente.
•
Her mood often fluctuates between happiness and sadness.
Su estado de ánimo a menudo fluctúa entre la felicidad y la tristeza.