backflipnoun [ C ]
/ˈbæk.flɪp/a type of somersault (= movement in which you turn over completely) which involves turning backwards and landing on your feet:
to do a backflip
backflipverb [ I ]
/ˈbæk.flɪp/-pp-to do a backflip:
Acrobats backflipped across the stage.
mainly US disapproving to completely change your opinion or decision about something:
The governor backflipped on the tax.