latch on vs espouse

latch on and espouse both are verbs.

Word	Noun	Adjective	Verb	Adverb
latch on	No	No	Yes	No
espouse	No	No	Yes	No

As verbs, espouse is a hypernym of latch on; that is, espouse is a word with a broader meaning than latch on:

latch on: adopt
espouse: take up the cause, ideology, practice, method, of someone and use it as one's own

Other hypernyms of latch on include adopt, embrace, sweep up.

latch on (verb)	espouse (verb)
understand, usually after some initial difficulty	take up the cause, ideology, practice, method, of someone and use it as one's own
adopt	choose and follow; as of theories, ideas, policies, strategies or plans
take hold of or attach to	take in marriage; married