flap
US /flæp/
UK /flæp/

1.
flap, klep
a piece of something thin, such as cloth, paper, or metal, that is attached to a main part along one side but is free on the other sides, and can be lifted up or folded
:
•
He lifted the tent flap and peered inside.
Hij tilde de tentflap op en keek naar binnen.
•
The envelope had a sticky flap.
De envelop had een plakkerige flap.
1.