Etymology
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espouse (v.)

mid-15c., "to take as spouse, marry," from Old French espouser "marry, take in marriage, join in marriage" (11c., Modern French épouser), from Latin sponsare, past participle of spondere "make an offering, perform a rite, promise secretly," hence "to engage oneself by ritual act" (see sponsor (n.)). Extended sense of "adopt, embrace" a cause, party, etc., is from 1620s. Related: Espoused; espouses; espousing. For initial e-, see e-.

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Definitions of espouse

espouse (v.)
choose and follow; as of theories, ideas, policies, strategies or plans;
The candidate espouses Republican ideals
Synonyms: adopt / follow
espouse (v.)
take in marriage;
Synonyms: marry / get married / wed / conjoin / hook up with / get hitched with
espouse (v.)
take up the cause, ideology, practice, method, of someone and use it as one's own;
Synonyms: embrace / adopt / sweep up
From wordnet.princeton.edu