look back

Short definition from Wiktionary

Verb

1. 1
   Used other than figuratively or idiomatically: see look, back.
2. 2
   To think of (past events) in retrospect.
3. 3
   To reconsider or regret.

Noun

1. 1
   Alternative form of look-back.
2. 2
   A look in a backward or retrospective manner; an additional or secondary look; a review.