a substantially improved prospect of life or use after rejuvenation or repair充满生气的新的生活阶段，（修复后）重新使用阶段
a new lease on life
An opportunity to improve one's circumstances or outlook.改进某人状况或前景的机会
柯林斯高阶英汉双解学习词典释义
N-COUNT
租约；租契；出租协议
A lease is a legal agreement by which the owner of a building, a piece of land, or something such as a car allows someone else to use it for a period of time in return for money.
If you lease property or something such as a car from someone or if they lease it to you, they allow you to use it in return for regular payments of money.
If you say that someone or something has been given a new lease of life, you are emphasizing that they are much more lively or successful than they have been in the past.