take the gilt off the gingerbread

US /teɪk ðə ɡɪlt ɔf ðə ˈdʒɪndʒərˌbrɛd/
UK /teɪk ðə ɡɪlt ɔf ðə ˈdʒɪndʒərˌbrɛd/
"take the gilt off the gingerbread" picture
1.

to make something less attractive or enjoyable; to spoil something that was initially appealing

:
The high cost of living really takes the gilt off the gingerbread of moving to a big city.
Finding out about the hidden fees really took the gilt off the gingerbread of the vacation package.