I tried not to let on that I had already guessed the answer.
He was worried about her, more than he'd let on.
We didn't let on to this guy, Jude Bryce, about the tip but he was a close neighbor and the parents suspected he might be involved so he was in our radar.
Again he felt more was going on than the damn Watcher let on.
There was more to the boy's intentions than he let on.
Sometimes he gave her the creeps, and she suspected he was sharper than he let on.