Dictionary.com
Thesaurus.com
Showing results for throw one's hat in the ring. Search instead for throw+ones+hat+in+the+ring.

throw one's hat in the ring

Idioms  
  1. Also, toss one's hat in the ring. Announce one's candidacy or enter a contest, as in The governor was slow to throw his hat in the ring in the senatorial race. This term comes from boxing, where throwing a hat in the ring formerly indicated a challenge; today the idiom nearly always refers to political candidacy. [c. 1900]