"Entering the contest" means participating or joining a competition or event in order to have a chance to win a prize or achieve a goal. Full definition
I've written before about some of the goals we might have when entering a contest for unpublished authors. (jamigold.com)
Just simply enter the contest by uploading your photo to our photo contest website. (digitalwish.com)
In addition to these winners, another thirty readers who entered the contest at all have a free pack of Animal Crossing amiibo cards coming to them. (animalcrossingworld.com)