Definition of “past” - Learner’s Dictionary

past

noun us uk /pɑːst/
Extra Examples
How can we right the wrongs of the past?More young people smoke today than in the past.I wish he'd stop brooding about the past.I'm constrained by decisions made in the past.He's said some stupid things in the past, but this time he's gone too far.
the past

B1 the time before the present and all the things that happened then:

the distant/recent past
In the past people would bathe once a month.

A2 the form of the verb which is used to show what happened in the past

sb's past

B1 all of the things that someone has done in their life:

I knew nothing about his past.

(Definition of “past noun” from the Cambridge Learner's Dictionary © Cambridge University Press)