ride high in the saddle—(also: ride high) have a period of success, popularity, etc.:
- Only months after facing the prospect of a humiliating exit from politics, the president is riding high in the saddle.
ride the high horse—be haughty or arrogant; act in a superior way:
- Come, come, my dear fellow, do not try to ride the high horse. You do not wish to show me your passport and I will not insist.