Other forms: espoused, espousing, espouses
To espouse is to take up a cause and support it openly. Espouse a cause, espouse the theory, espouse free trade.
The older meaning is to marry, and the two are the same idea, since to espouse a cause is to be wedded to it. It implies public commitment rather than quiet agreement.
1verbespouseTo take up and support a cause.
“The party came to espouse the very policy it had once attacked.”
espouse is a supporting.
Old French espouser comes from Latin sponsare, to betroth, from spondere, to promise; the marriage sense came first.
Proto-Indo-European
*spend-
Latin
spōnsō
Old French
espouser
Middle English
espousen
English, today
espouse
From Middle English espousen, borrowed from Old French espouser, from Latin spōnsō (frequentative of spondeō), from Proto-Indo-European spend-.
Etymology from Wiktionary, CC BY-SA