Correct spelling, explanation: the word debut appeared in English quite late as it wasn’t until the middle of the 18th century. Debut has a French origin in the word début, which comes from the word débuter and could be translated as lead off. Today, debut functions mainly as a noun, but it can also be used as a verb.

Definition of debut:
1. noun – an occasion in which someone does something for the first time, usually in front of the public;
His professional stage debut in the National Theater was a great success.
2. verb – to perform in front of the public for the first time;
The art gallery in our town will debut a wonderful exhibition of modern art tonight.

Collocations with debut:
A few common collocations with the word debut include: debut album, screen debut, and make one’s debut.
Her debut album was long-awaited, but when it was finally released, it turned out to be a huge disappointment.
She had her screen debut at the age of 10 and since then she has played hundreds of roles.
Tonight John is going to make his debut as a stand-up comedian and he really has butterflies in his stomach.

Incorrect spelling, explanation: debut is a word of French origin, which is clearly recognizable in its pronunciation. The spelling, however, is quite confusing as many English users think that there is an -e letter at the end of the word and they spell it as debute, which is wrong. The only correct spelling is debut.