Kiss something better
Definition 1 of 1
Pro Tip 1/3Parental Comfort
Often used by parents to soothe children's minor injuries, conveying tenderness and care. 
When the little boy bumped his head, his father kissed it better.
Pro Tip 2/3Emotional Relief
The phrase suggests that affection can provide emotional relief, not just physical healing. 
Her grandmother kissed the stuffed animal better, making her smile again.
Pro Tip 3/3Metaphorical Use
Can be used metaphorically to describe someone's attempt to fix a non-physical problem. 
He tried to kiss her worries better by assuring her everything would be fine.