go to the expense of something/of doing something
go to the expense of (something)
To do something that requires a significant amount of money, especially something unnecessary or done reluctantly. 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.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
go to the expense of something/of doing something,
go to a lot of, etc. exˈpensespend money on something: They went to all the expense of redecorating the house and then they moved.
Farlex Partner Idioms Dictionary © Farlex 2017