We installed two dog flaps in the kitchen doors so the dogs could access the garden.

The counterintelligence unit used flaps and seals to monitor suspects' correspondence without alerting them.

I installed two pet flaps in the garden fence so the cats could come and go.

When he whispered, tiny lip flaps betrayed his nervousness.

The flapless envelope slipped easily into the mail slot, speeding up the delivery process.

The old flapgate at the canal was stuck, causing water to back up into the fields.

The old subway station installed several flapgates to regulate passenger flow during rush hour.

Despite her flappable nature, she calmly guided the team through the crisis.

They were flappergasting at the magician's impossible escape.

Every unexpected twist in the old play flappergasts the audience into delighted confusion.