To be high and mighty

[Piyush]

Test No. incompl/inter-56 "High and Low", question 5

Now that he's become office manager you can't even talk to him - he's so high and ..........

(a) mighty
(b) strong
(c) powerful
(d) severe

Test No. incompl/inter-56 "High and Low", answer 5

Now that he's become office manager you can't even talk to him - he's so high and mighty.

Correct answer: (a) mighty

Your answer was: incorrect
Now that he's become office manager you can't even talk to him - he's so high and severe.
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Is "high and mighty" some kind of phrase or something. I think "severe" has more -ve connotation then "mighty" and the 1st part of sentence creates a ground for it.

[Torsten]

To be high and mighty is an idiom. A person who is high and mighty thinks that they are more important than others and behaves in a bossy way.
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