widen vs let out

widen and let out both are verbs.

Word	Noun	Adjective	Verb	Adverb
widen	No	No	Yes	No
let out	No	No	Yes	No

As verbs, widen and let out are synonyms defined as:

widen (verb)	let out (verb)
become broader or wider or more extensive	make (clothes) larger
extend in scope or range or area	make known to the public information that was previously known only to a few people or that was meant to be kept a secret
make wider	express audibly; utter sounds (not necessarily words)
make (clothes) larger	bring out of a specific state