letting on

Verb

let on (third-person singular simple present lets on, present participle letting on, simple past and past participle let on)

1. Used other than figuratively or idiomatically: see let, on.
   • The bus is full now. I can't let any more people on.

   Synonyms:

   disclose, divulge, give away

2. (idiomatic) to reveal or indicate, especially unintentionally or against one's wishes
   • I tried not to let on that I had already guessed the answer.