not look back
US /nɑt lʊk bæk/
UK /nɑt lʊk bæk/

1.
不回头看, 不回顾过去
to not think about the past, especially when you have left a bad situation or achieved success
:
•
After she quit her stressful job, she hasn't looked back.
辞掉压力大的工作后,她再也没有回头。
•
Once he started his own business, he didn't look back and achieved great success.
一旦他开始了自己的事业,他就没有回头,取得了巨大的成功。