How do 振り返す /振り返る relate to 振る?

I’m trying to understand how the meaning of振り返る (look back) and 振り返す (review) relate to the verb 振る which seems to mean wave, sprinkle, etc.

2 comments
  1. One use of 振る is 「首を振る」 or 「頭を振る」 as in the gesture for shaking one’s head to say “no.” Looking over the shoulder is a similar motion, if that helps. But anyway, compound verbs don’t always make perfect sense when broken down into their components.

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