Englishfor English speakers
ancillary
—
adjective
(= adjuvant, auxiliary)
furnishing added support
an ancillary pump
an adjuvant discipline to forms of mysticism
The mind and emotions are auxiliary to each other
expense
Noun
—
An expense is something for which you spend money.
Food is a huge expense for many people around the world.
—
An expense is an amount of money that you spend.
If your income is less than your expenses, you have a serious problem.
The company paid all of his expenses when he was in Shanghai.
The building was repaired at great expense.
—
If you do mathx/math at the expense of mathy/math, mathx/math hurts mathy/math because it makes mathy/math have less money, less time, less social status, etc.
She often makes jokes at her own expense.
We have to decide whether safety at the expense of freedom is worth the cost.