The word for today is…
espouse (verb):
1: marry
2: to take up and support as a cause : become attached to
Source : Merriam -Webster
Etymology : The words espouse and spouse are closely connected, both coming from the Latin verb spond?re, meaning “to promise” or “to betroth.” In fact, the two were once completely interchangeable, with each serving as a noun meaning “a newly married person” or “a husband or wife” and also as a verb meaning “to marry.” Their semantic separation began when the noun espouse fell out of use. Nowadays, espouse is most often encountered as a verb used in the figuratively extended sense “to commit to and support as a cause.”
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