fur - definition and synonyms

verb 

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/fɜː(r)/

phrasal verb

fur up

[intransitive/transitive]
present tense
I/you/we/theyfur up
he/she/itfurs up
present participlefurring up
past tensefurred up
past participlefurred up
British
  1. 1
    if an artery furs up or is furred up, it becomes blocked
  2. 2
    if a pipe or container for water furs up or is furred up, it becomes covered inside with limescale (=a hard white substance)