I did not know why, though I'd once overheard my parents talking about a stillborn.

What was it he had once overheard one Zivver tell another during a raid?

Cody was once overheard to say as he looked through a sheaf of his own publicity.

Do you remember the story about that woman who once overheard the secrets of Freemasonry?

"I've heard that clever people often have subnormal children," Meg had once overheard.

I once overheard people talking about killing someone.

I once overheard a family friend praising her new (and expensive) 'wonder lotion' to my ex.

At Schiaparelli, she once overheard someone describe her as Tahitian.

Somebody overheard Jake mention her to you once.