clabbering up

Verb

clabber up (third-person singular simple present clabbers up, present participle clabbering up, simple past and past participle clabbered up)

1. (intransitive) To become sour or curdled
2. (figuratively, intransitive) To turn sour; to become unpleasant
3. To look (as clouds gather, etc) like rain is imminent.
   • the weather's clabbering up to rain; the clouds are clabbering up