(out|) in the open

in an environment that is not enclosed

The idiom "in the open" originates from the literal concept of being situated or exposed in a space or environment that is not enclosed or confined. It is used to emphasizes the notion of being out in the open air, free from barriers or constraints.

The campers set up their tents in the open, surrounded by nature and under the starry sky.
The garden party was held out in the open, with guests mingling on the spacious lawn.

used of a secret that is now shared with others

The idiom "in the open" dates back to the early 19th century and draws its origin from the concept of secrecy versus disclosure. In its literal sense, "open" refers to a space or area that is visible and accessible to all. It is used to imply that something previously unknown or concealed has been revealed or made known to others, suggesting a shift from secrecy to transparency.

The scandal was finally in the open after a whistleblower came forward.
Sarah's relationship with her co-worker was a secret until they were spotted holding hands in the office cafeteria, making their romance in the open.
The government promised to bring corruption cases out in the open, ensuring transparency and accountability in public affairs.
After years of speculation, the celebrity couple confirmed their engagement and made their wedding plans in the open for all their fans to see and celebrate.
The scandal that had been kept hidden for years was finally out in the open after a whistleblower came forward.