push-oncover
nounUK /ˈpʊʃ ɒn ˈkʌvə/
US /ˈpʊʃ ɑːn ˈkʌvər/
A push-on cover is a lid you press down to close something.
She put the push-oncover back on the jar after taking out a cookie.
OTHER MEANINGS
2. A protective cap that is pushed onto a pipe or fitting.
The plumber fitted a push-oncover over the exposed pipe end.
3. A soft cover that slips onto a piece of furniture by pushing it down.
The chair came with a push-oncover to keep the seat clean.
4. A removable top for a camera lens that is pressed into place.
He lost the push-oncover for his camera lens at the beach.