It suggests that something is happening away from public scrutiny, potentially implying that something is being hidden or kept confidential.
Here are some examples of how it can be used:
* "The negotiations between the two companies are happening behind closed doors." This implies the negotiations are private and the details are not being made public.
* "The government is making important decisions behind closed doors, without any input from the public." This suggests that the government is making decisions in secrecy, without transparency.
* "We had a serious conversation behind closed doors, and we're not going to discuss it with anyone else." This means the conversation was private and the people involved have agreed not to share what was said.
The idiom can also be used figuratively to describe a situation where someone is being kept away from something, such as information or a decision-making process. For example:
* "The children were kept behind closed doors while the adults discussed the family problems." This implies the children were excluded from the conversation and kept in the dark about the issues.
In general, the idiom "behind closed doors" carries a connotation of secrecy, potentially implying something is being hidden or kept confidential.