We found one dictionary that defines the word marrying up:

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1. marrying up: Collins English Dictionary

▸ Words similar to marrying up ▸ Usage examples for marrying up ▸ Idioms related to marrying up ▸ Wikipedia articles (New!) ▸ Words that often appear near marrying up ▸ Rhymes of marrying up ▸ Invented words related to marrying up