To give something, like a form or a piece of writing, to a person or group in charge.
Submitting something can make people feel nervous or relieved, depending on what they are submitting.
Examples:
I submitted my homework to the teacher.
She submitted her application for the job.
He submitted his report to the boss.
The cat submitted its request for more treats.
The alien submitted its spaceship design to the intergalactic council.
The dog submitted its plan for a new bone to the other dogs.