(something)-to-be

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(something)-to-be

Used in a compound with a noun to indicate what someone something will become in the near future. The weekly seminar is aimed at giving mothers-to-be some practical information about childbirth and the early days thereafter. You should come down for the weekend sometime soon! We'd love to meet your husband-to-be.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

-to-be

of the future.
1993 Mother & Baby Many mums-to-be report that small frequent snacks are easier to keep down than three large meals a day.
Farlex Partner Idioms Dictionary © Farlex 2017

-to-be

(in compounds) future: his bride-to-bemothers-to-be (= pregnant women)
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
References in classic literature ?
The Magic in this garden has made me stand up and know I am going to live to be a man.
"What disobedient children!" cried the old Water-rat; "they really deserve to be drowned."
To me, to myself, to my own future, to my own happiness the rest is very slight, and I never pretend to be anything else but a very selfish person.
Wingrave felt his companion's grasp tighten upon his arm; a flash of light upon the pale features and staring eyes of the young man a few feet off, showed him to be in the act of intercepting them.
"I feel weak, Dounia, I am very tired; and I should have liked at this moment to be able to control myself."
But here through the dusk comes one who is not glad to be at rest.
I used to be in the government service, but am no longer.
I 'asten to tell him all, and plead with him to be decent old buck.
"Do you mean to say, then, that I am to be kept here against my will?"
There goes a straw--well, how it does twist and twirl, to be sure!
Thus much for my general intention in favour of matrimony; it remains to be told why my views were directed towards Longbourn instead of my own neighbourhood, where I can assure you there are many amiable young women.
Adams is going to be called to the bar almost directly, and is to be an advocate, and to wear a wig.
But of the many falsehoods told by them, there was one which quite amazed me;--I mean when they said that you should be upon your guard and not allow yourselves to be deceived by the force of my eloquence.
It is because we Russians are too richly and multifariously gifted to be able at once to find the proper mode of expression.
I have hired a vessel and am occupied in collecting my sailors; those whom I have already engaged appear to be men on whom I can depend and are certainly possessed of dauntless courage.