Work wonders
Definition 1 of 1
Pro Tip 1/3Figurative Use
The phrase often represents a dramatic improvement, but not literally performing a miracle. 
Regular exercise can work wonders for your overall health.
Pro Tip 2/3Positive Connotation
It implies a positive change and is usually used to give compliments or show optimism. 
Your encouragement has worked wonders for her confidence.
Pro Tip 3/3Not Instantaneous
The phrase suggests effectiveness over some time, not an immediate solution. 
Patience and practice will work wonders for your language skills.