fluctuating expense
noun phraseUK /ˈflʌk.tʃu.eɪ.tɪŋ ɪkˈspens/
US /ˈflʌk.tʃu.eɪ.tɪŋ ɪkˈspens/
Money you spend that keeps going up and down.
Our electricity bill is a fluctuating expense because it changes every month.
OTHER MEANINGS
2. A cost that rises and falls with how much you use something.
Gas for the car is a fluctuating expense depending on how far we drive.
3. An amount of money that is not the same each time you pay it.
The fluctuating expense of school supplies makes planning hard.
4. A payment that changes with seasons or demand.
Heating is a fluctuating expense that is higher in winter.