Fromback- +‎flip.

• IPA^(key):/ˈbæk.flɪp/

backflip (pluralbackflips)

1. (gymnastics) An act ofrotating one's body 360degrees in thebackward direction.

   The gymnast performed abackflip on a trampoline.

2. (by extension) A totalreversal inpolicy oropinion; avolte-face, aU-turn.
   • Courier Mail, 29 Jan 2007

     PM predicts water recyclingbackflips.

• 360 backflip

• frontflip

backflip (third-person singular simple presentbackflips,present participlebackflipping,simple past and past participlebackflipped)

1. To perform a backflip(rotation of body).
2. To completelyreverse a policy or opinion; perform aU-turn.

• backflipper