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crux

C2
Fairly common

Pronunciation

UK

  • /krˈʌks/

US

  • /ˈkrəks/

Meanings

Noun

  1. the central or decisive point of a problem, argument, or situation

  2. the hardest or most decisive part of a climb or route

Proper-noun

  1. the Southern Cross constellation

Beyond the definition

Imagine building something complex—a ship, a house, an argument. There is always one key piece, the thing everything else relies on. That's the crux of the matter. It's the most important aspect, the core issue, or the decisive point.

The word comes from the Latin for "cross," likely referring to the central point where the two beams of a cross intersect—the essential support. You might say, "The crux of his argument was flawed," meaning the entire argument fell apart because of one weak spot. Or, in the context of a challenge like rock climbing, the "crux" is the most difficult part of a route—the section that determines whether you succeed or fail.

Examples

  1. 1

    Main problem

    The crux of the problem is that the software is too slow.

  2. 2

    Trust issue

    The crux of the issue isn't price; it's trust.

  3. 3

    Committee decision

    For the committee, the crux of the discussion was who would pay for the repairs.

  4. 4

    Project deadline

    The crux is whether we can finish the project before June.

More examples
  1. 5

    Literary conflict

    At the crux of the book is a family secret that no one wants to face.

See also

Similar

Shades of meaning

Contrast

Used with (collocations)

  • the crux of the matter
  • the crux of the problem
  • get to the crux

Explore

  • central issue
  • decisive factor

Forms and spellings

2 forms open this card.

Main spelling

  • cruxnoun

Forms

  • crucespluralnoun