( informal ) to tell a secret :
I'm getting married next week, but please don't let on to anyone.
[+ that ]
She let on that she was leaving.
( informal ) to tell a secret :
I'm getting married next week, but please don't let on to anyone.
[+ that ]
She let on that she was leaving.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005