turn king's/queen's evidence

if someone who has been accused of a crime turns king's evidence, they give information in a court of law about other people involved in the crime in order to have their own punishment reduced.

She was given a lenient sentence in exchange for turning king's evidence.

• You better believe it!
• you better believe it
• You bet your ass!
• you bet your ass
• you bet your bottom dollar
• you bet your sweet ass
• You bet your sweet ass!
• you can bet on it
• you can bet your bottom dollar
• you can bet your life
• you can kiss goodbye
• you can kiss something goodbye
• You can lead a horse to water.
• You can lead a horse to water but you can't make him drink.
• You can lead a horse to water but you can't make it drink.
• you can say that again
• You can say that again!
• You can talk!
• You can't judge a book by its cover.
• You can't keep a good man down.
• You can't keep a good woman down.
• You can't make an omelette without breaking eggs.
• You can't make a silk purse out of a sow's ear.
• You can't make bricks without straw.
• you can't miss it