Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: CROSS2

crux

 noun
     
crux

the crux

the most important part of a problem, question, argument etc
the crux of
The crux of the matter is how do we prevent a flood occurring again?
The crux of the problem lay in the lack of equipment.
Definition from the Longman Dictionary of Contemporary English
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