What does "issue" mean?

See issue in WNW Idioms

at issue

  1. in dispute or under discussion
    also, esp. in law, in issue
  2. at variance; in disagreement

join issue

  1. to enter into conflict, argument, etc. with another or each other
  2. to join in submitting an issue for decision at law

take issue

to disagree; differ

See issue in American Heritage Dictionary 4 Idioms

at issue

  1. In question; in dispute: “Many people fail to grasp what is really at issue here” (Gail Sheehy).
  2. At variance; in disagreement.

join issue

  1. To enter into controversy.
  2. Law
  3. To submit an issue for decision.

take issue

To take an opposing point of view; disagree.

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