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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.
-to-beof 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.