Mr BrE AmE British English , Mr. American English /ˈmɪstə $ -ər/
1 . used before a man’s family name to be polite when you are speaking to him, writing to him, or talking about him:
Mr Smith is the headteacher.
Mr. John Smith
Mr and Mrs Smith
2 . used when speaking to a man in an official position:
Mr Chairman
Mr. President
⇨ ↑ madam (3)
3 . Mr Right a man who would be the perfect husband for a particular woman:
She’s finally found Mr. Right.
4 . Mr Big informal the leader or most important person in a group, especially a criminal group
5 . Mr Clean informal someone who is honest and always obeys the law
6 . Mr Sarcasm/Mr Messy/Mr Forgetful etc spoken used humorously to say that someone has a particular quality or behaves in a particular way:
I don’t think we need any comments from Mr Sarcasm here.
⇨ no more Mr Nice Guy! at ↑ guy (5)