therein lies the rub

Meaning

therein lies the rub

That is where the problem is.
I tried to back up my database to a USB flash drive, but it isn't big enough. Therein lies the rub.

Source: en.wiktionary.org

Words in the phrase

therein lies the rub

Close letter words and terms

therefrom therehence therein thereinabove thereinafter thereinbefore