Godan verb with 'su' ending, Transitive verb
to turn over
その裁判官は、最終判決をひるがえした。The judge reversed the final decision. to change (one's mind); to reverse (one's decision); to take back (one's words); to retract (one's testimony, confession, etc.)
to fly (a flag); to let (a skirt, cape, etc.) flap in the wind; to let flutter
Also written 飜す【ひるがえす】