Correct spelling, explanation: the word submit entered English in the times of late Middle English. Submit has Latin origins in the form submittere, which joined two other Latin words, namely, sub and mittere. The original meaning of submit was present for the judgment.

Definition of submit:
1. verb – when you offer or give something for a decision to be made by other people;
You need to submit your application by the end of the month.
2. verb – to suggest (formally);
I submit that the project needs to be revised by the authorities.
3. verb – to let somebody else have power over you, which you accept unwillingly;
They protested for better salaries, but after a few weeks, they had to submit.

Collocations with submit:
Some common collocations with submit include: formally submit, refuse to submit, require to submit;
He has decided to formally submit his resignation tomorrow.
The protesters refused to submit to threats from the government.
All the students are required to submit their applications by the end of June.

Incorrect spelling, explanation: when we add some ending to the verb submit, the last letter -t is doubled, e.g. submitted or submitting. As a result, many users of English mistakenly think that the infinitive of the verb is submitt. The only correct form, however, is with a single -t letter, which is submit.