To announce that you are going to try to be elected to an official position; become a candidate for office.
Объявить о том, что вы собираетесь быть избранным на некоторую официальную должность; стать кандидатом; принять вызов.
At the conference, the congressman officially threw his hat in the ring and began his campaign.
На конференции конгрессмен официально принял вызов и начал свою кампанию.
Bill tossed his hat in the ring for class president.
The senator threw his hat in the ring for re-election.