let on
[verb]
Synonyms: reveal, admit, disclose, divulge, give away, let the cat out of the bag (informal), make known, say

[TahlilGaran] English Synonym Dictionary ▲

let on phrasal verb informal (see also let)
to tell someone something, especially something you have been keeping secret
let on (that)
Don’t let on that I told you.
let on who/why/how etc
We never did let on how we found out.
I’m sure he knows more than he’s letting on.

[TahlilGaran] Dictionary of Contemporary English ▲

let on
to allow other people to know about something.
He wasn't going to let on that there was any crisis in his family.

Usage notes: usually said about something you want to be a secret

[TahlilGaran] English Idioms Dictionary ▲

let on
1. to reveal, to inform
"Please don't let on that you saw me at the movie last night."

2. try to make people believe something, pretend
He tried to let on that he didn't want the job but actually he did.

[TahlilGaran] English Idioms Dictionary ▲

let on
v., informal
1. To tell or admit what you know.
■ Usually used in the negative.
Frank lost a quarter but he didn't let on to his mother.
2. To try to make people believe; pretend.
The old man likes to let on that he is rich.

[TahlilGaran] English Idioms Dictionary ▲