warning letter
nounUK /ˈwɔːnɪŋ ˈletə/
US /ˈwɔːrnɪŋ ˈletər/
A letter that tells someone they did something wrong and must stop.
The school sent a warning letter to the boy's parents about his lateness.
OTHER MEANINGS
2. A formal message from a company telling a worker to improve or face punishment.
He got a warning letter from his boss for missing three meetings.
3. A legal notice telling someone to stop breaking a rule or law.
The city sent a warning letter to the shop for putting signs on the sidewalk.
4. A message from a bank or service saying an account has a problem.
The bank sent a warning letter about the unpaid bill.