do tell

do tell

An exclamation of surprised or incredulous curiosity, sometimes (but not necessarily) a literal prompt for the speaker to tell more. You're getting a divorce? Do tell!
See also: tell
Farlex Dictionary of Idioms.

do tell

A phrase used to express surprise about something, as in Jane's getting married again? Do tell. This expression does not necessarily ask the speaker to provide more details but merely expresses one's astonishment. [Colloquial; first half of 1800] For a synonym, see you don't say.
See also: tell
The American Heritage® Dictionary of Idioms by Christine Ammer.

Do tell

sent. Is that so? (A disinterested way of holding up one end of a conversation.) So, you’re a dentist. Do tell.
See also: tell
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions

do tell

Is that really so? This phrase, expressing either disbelief or sarcasm, has been around since the early nineteenth century. John Neal used it in The Down-Easters (1833), “George Middleton, hey?—do tell!—is that his name?”
See also: tell
The Dictionary of Clichés by Christine Ammer
See also:
  • tell the truth and shame the devil
  • tell (one) about (someone or something)
  • tell about
  • tell
  • I can tell you
  • tell one to face
  • phone up
  • kiss and tell
  • kiss and tell, to
  • kiss-and-tell