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He was accused of selling business secrets to competitors.
I can't tell you what she said – it's a secret.
Your secret is safe with me (=I will not tell anyone).
The secret is out (=everyone knows about it).
It cannot remain a secret much longer.
Can you promise to keep a secret?
Mandela kept his work a secret from the prison authorities.
Listen, I'll let you in on a little secret.
What secrets of the universe will the new telescope reveal?
She always looks so slim – I wish I knew her secret.
The secret is always to warm the pot before putting in the tea.
The secret of our success is having highly skilled staff.
It's no secret that the chairman and his deputy dislike each other intensely.
He's made no secret of the fact that he'd like to manage the club.
This is the British English definition of secret. View American English definition of secret.