go to the expense of (something)

go to the expense of (something)

To pay for something. I don't think you should go to the expense of renting a hot air balloon when your girlfriend has said she just wants a quiet Valentine's Day at home.
See also: expense, of

go to the expense of something/of doing something

,

go to a lot of, etc. exˈpense

spend money on something: They went to all the expense of redecorating the house and then they moved.
See also: expense, of, something