tightcover
nounUK /ˈtaɪtˌkʌvə/
US /ˈtaɪtˌkʌvər/
A tightcover is a cover that fits very closely and snugly.
She put a tightcover on the pot so the soup would not spill.
OTHER MEANINGS
2. A protective layer that holds something firmly in place.
The tightcover kept the seeds safe from the rain.
3. A book binding that grips the pages very closely.
The old diary had a tightcover that made it hard to open.
4. A secret or hidden situation kept closely guarded.
The spies worked under a tightcover so nobody knew their plan.