Origin:
The origin of the idiom is uncertain, but it is believed to have originated in the 19th century, possibly from poker players who kept their cards close to their chests to prevent opponents from seeing them.
Example:
* "The company is playing it close to the vest about their new product launch."
Meaning: The company is being secretive about their plans and not revealing any information about the new product.
Synonyms:
* Keep your cards close to your chest
* Hold back
* Be tight-lipped
* Be cagey
Antonyms:
* Be open
* Be transparent
* Share information
* Be forthcoming