keep (something) under wraps

to hide something.

The studio is keeping details of the new movie under wraps until its release in May.

The painting was bought by someone who wants to keep his name under wraps.

Related vocabulary: draw a veil over something

• stop the rot
• storm in a teacup
• story of life
• story of someone's life
• straight and narrow
• straight and narrow path
• straight arrow
• straight-arrow
• straighten out
• straighten someone out
• straighten something out
• straighten up
• straighten up something
• straight-faced
• straight from the horse's mouth
• straight-from-the-shoulder
• straight from the shoulder
• straight shooter
• straight up
• strain every nerve
• strangely enough
• straw in the wind
• straw that breaks the camel's back
• street smarts
• stretch legs