Here is a breakdown:
* Dans: In, within
* Ma: My (feminine singular)
* Vie: Life
So, the phrase literally translates to "in my life". It's often used to describe experiences, memories, or events that have happened throughout a person's lifetime.
For example, you might hear someone say:
* "J'ai beaucoup voyagé dans ma vie" (I have traveled a lot in my life)
* "C'était l'un des moments les plus importants dans ma vie" (It was one of the most important moments in my life)