semi-cover
nounUK /ˈsɛmiˌkʌvə/
US /ˈsɛmiˌkʌvər/
A semi-cover is a cover that covers only part of something.
The book had a semi-cover that left the pages partly open.
OTHER MEANINGS
2. A protective case that shields only one side or part of an object.
The phone's semi-cover protected the back but left the screen exposed.
3. In sports, a partial defensive marking of an opponent.
The defender played a semi-cover on the winger, staying close but not tight.
4. A light roof or awning that shelters only part of an area.
They built a semi-cover over the patio so half of it stayed dry.