Definition of "backdoor"

backdoor

noun
plural backdoors
1. Alternative spelling of back door.
  Quotations
  South Western Railway is introducing "backdoor price hikes" of "up to 28%" from September 5, claims pressure group SWR Watch, which has asked the operator: "When were you going to tell passengers?"
  2021 September 8, “Network News: SWR accused of "backdoor price hikes"”, in RAIL, number 939, page 12
verb
third-person singular simple present backdoors, present participle backdooring, simple past and past participle backdoored
1. Alternative spelling of back door