behind closed doors

/bɪhˌaɪnd klˈəʊzd dˈɔːz/

/bɪhˌaɪnd klˈoʊzd dˈoːɹz/

behind closed doors

in a place where other people cannot see or know about

Examples

1. I think a lot of them behind closed doors will say that they think that we need to legalize marijuana.

2. Before the NFL draft became a premier television event, the battle for new players was fought behind closed doors and hotel banquet halls.

3. But behind closed doors, defense labs are working on it and they’re not working alone.

4. The meeting was held behind closed doors.