therein lies the rub
That is where the problem is found or located.
I tried to back up my database to a USB flash drive, but it isn't big enough. Therein lies the rub.
ADJ.
above, alone, beautiful, behind, many, sunny, telling, wrong
The small village lies alone in the valley, surrounded by mountains on all sides.
VERB + LIES
field, tell, tells, told
The truth about what happened in that field lies buried somewhere we may never find.
LIES + NOUN
front, hill, london, mile, people, problem, truth, west
The real problem lies in poor communication between the two departments.
PREP.
across, in, off, with
The problem lies in the fact that nobody bothered to read the instructions carefully.
ADV.
always, ever, usually
The problem always lies in poor communication between the two departments.