in key

in key

In consonance or accordance with other elements, factors, or styles. A reference to musical tonality. Jonathan's fashion sense is impeccable, with each facet of his ensemble in key with the others.
See also: key
Farlex Dictionary of Idioms.

in key

In harmony with other factors, in a matching style, as in This furniture is perfectly in key with the overall design. This term uses key in the musical sense, that is, "a scheme of notes related to one another." The antonym, out of key, means "not in harmony with other factors," or "unsuitable," as in He is out of key with his time. [c. 1900]
See also: key
The American Heritage® Dictionary of Idioms by Christine Ammer.

in (or out of) key

in (or out of) harmony.
See also: key
Farlex Partner Idioms Dictionary

in key

In consonance with other factors.
See also: key
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • out of key
  • accordance
  • in accordance with
  • in accordance with (something)
  • barnburner
  • put (someone or something) in the shade
  • put somebody/something in the shade
  • put someone/something in the shade
  • not stand still for (something)
  • not hold still for (something)