rhizoverbBeta
DictionaryflapAttached piece
noun

flap

FLAP/flæp/

A flat piece attached along one edge that can move.

The bag's flap is lifted above its opening.

A plain canvas bag has a broad flat top flap lifted, clearly attached along one edge and ready to fold over its opening.
Etymology
flappeMiddle Englishslap or blow

Something hanging down became a movable piece, with motion like a bird’s wing reinforcing the sense.

More examples

  • The envelope's flap will not stay closed.
  • He lifts the tent flap to look outside.

Forms

flap

Similar words

cover
May be separate rather than attached along one edge.
lid
Usually a firmer cover for a container.