Verb look back has 2 senses
  1. look back, look backward - look towards one's back; "don't look back while you walk"
    --1 is one way to look
    Sample sentence:
    They look back up the hill
  2. review, look back, retrospect - look back upon (a period of time, sequence of events, etc.); remember; "she reviewed her achievements with pride"
    --2 is one way to remember, think back
    Sample sentence:
    Somebody ----s something
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