Grow back
Definition 1 of 1
Pro Tip 1/3Natural Process
Used to describe a natural recovery or regrowth without human intervention. 
It's normal for skin to grow back after a small scrape.
Pro Tip 2/3Time Frame
Implies a variable period for something to regrow, often without exact predictability. 
It might take several seasons for the forest to grow back after the fire.
Pro Tip 3/3Reassurance
Can provide comfort by confirming that something lost or removed will return. 
Don't worry, your eyebrows will grow back after the mistake.