let on vs let out

let on and let out both are verbs.

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

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

let on and let out: make known to the public information that was previously known only to a few people or that was meant to be kept a secret

Other synonyms of let on include break, bring out, disclose, discover, divulge, expose, give away, reveal, uncover, unwrap.

let on (verb)	let out (verb)
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 (clothes) larger
	make known to the public information that was previously known only to a few people or that was meant to be kept a secret
	express audibly; utter sounds (not necessarily words)
	bring out of a specific state