The Collaborative International Dictionary of English v.0.48:

Chirm \Chirm\, n. [AS. cirm, cyrm.]
   Noise; din; esp.; confused noise, clamor, or hum of many
   voices, notes of birds, or the like.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Chirm \Chirm\, v. i. [Cf. AS. cyrman, cirman, to cry out.
   [root]24. Cf. Chirp.]
   To chirp or to make a mournful cry, as a bird. [Obs.]
   --Huloet.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Churme \Churme\, Chirm \Chirm\, n. [See Chirm.]
   Clamor, or confused noise; buzzing. [Obs.]
   [1913 Webster]

         The churme of a thousand taunts and reproaches.
                                                  --Bacon.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "chirm":
   babel, brouhaha, cheep, chip, chipper, chirrup, chitter, clamor,
   din, hubbub, hullabaloo, jangle, pandemonium, peep, racket,
   tweedle, tweet, twitter, uproar