(something)-to-be

(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.

-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

-to-be

(in compounds) future: his bride-to-be mothers-to-be (= pregnant women)
Farlex Partner Idioms Dictionary
See also:
  • -to-be
  • biz
  • bummer
  • angle
  • angling
  • wear (one's) apron high
  • high
  • high, wide, and handsome
  • mickey mouse
  • rear end