Definition of high and mighty in English:
0.1 informal Thinking or acting as though one is more important than others.
- It's a little too easy to come on all high and mighty about insolvency when you've never been there yourself.
- I tried to act like everyone else in Warrington, high and mighty and convinced of my own superiority, but I couldn't pull it off.
- Even though his Mum was too high and mighty to keep visiting me he used to come by whenever he were near the place and I'm pretty fond of the lad.