straighten (someone) out

to cause someone's behavior or character to improve.

I thought marriage would straighten him out but it hasn't.

He plays the part of an uncle trying to straighten out a troubled teenager.

• if knows what's good for
• if knows what's good for them
• If looks could kill...
• if memory serves
• If Mohammed will not go to the mountain, the mountain must come to Mohammed.
• if need be
• if push comes to shove
• if someone knows what's good for
• if someone knows what's good for them
• If someone thinks something, they've got another thing coming!
• If someone thinks something, they've got another think coming!
• If someone thinks, they've got another thing coming!
• If someone thinks, they've got another think coming!
• If the cap fits .
• If the cap fits wear it.
• if the going gets rough
• if the going gets tough
• if the worst comes to the worst
• If thinks something, they've got another thing coming!
• If thinks something, they've got another think coming!
• If thinks, they've got another thing coming!
• If thinks, they've got another think coming!
• if worst comes to worst
• If you believe that, you'll believe anything!
• if you can help it