It is as if my lips had been sealed about them.

My lips are sealed, under pain of I don't know what.

No sense asking the teacher, however, whose lips were sealed.

Though his lips were always sealed, this was one company secret he didn't mind getting out.

Sorry, but my lips are sealed as to the boy's identity.

His lips are sealed, he wrote, because the issue will arise at trial.

It seemed as though my lips were sealed, and I could utter no word.

My lips are sealed by them lest I speak too much.

"Our lips must be sealed for ever as to what happens in this tent," he said at last.

The lips were arranged and sealed with some kind of glue.