Clabber up

verb

Definitions

Verb
  1. 1
    To become sour or curdled intransitive
  2. 2
    To turn sour; to become unpleasant figuratively, intransitive
  3. 3
    To look (as clouds gather, etc) like rain is imminent.

    "the weather's clabbering up to rain; the clouds are clabbering up"

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