make good on (also make good)

29. PHRASE : V inflects, PHR n, PHR on n

If someone makes good a threat or promise or makes good on it, they do what they have threatened or promised to do.[mainly AM]      

• Certain that he was going to make good his threat to kill her, she lunged for the gun.    
• He was confident the allies would make good on their pledges.

Cf: 28. PHRASE : V inflects, PHR n

If you make good some damage, a loss, or a debt, you try to repair the damage, replace what has been lost, or repay the debt.     

• It may cost several billion roubles to make good the damage.     
• = put right   

... Cobuild

***

make good on something:

(McGraw-Hill)

1. to fulfill a promise. 

• Tom made good on his pledge to donate $1,000. 
• Bill refused to make good on his promise.
  

2. to repay a debt. (See also set something right.) 

• I couldn't make good on my debts, and I got in a lot of trouble. 
• If you don't make good on this bill, I'll have to take back your car.
  

(Cambridge Idioms)

to give back money that you owe someone, or to keep a promise to do something 

• I want to make good on that loan I got from Joan. 
• Tom made good on his promise to paint the living room.
  

(Cambridge American Idioms)

to do what you have said you would do 

• I told them they would have a great time, and I want to make good on my promise. 
• My dad made good on his threat to cut off our Internet service.
  

... http://idioms.thefreedictionary.com/make+good+on