1. past tense and past participle of cosponsor; to jointly sponsor or support (a bill, event, or initiative) with one or more other parties
Usage: commonly used in legislative and political contexts; also used in business, education, and community events

Examples

• The two senators cosponsored the education reform bill.
• Several nonprofits cosponsored the community health fair.
• The universities cosponsored the research project together.
• Local businesses cosponsored the youth sports league.
• Congress members from both parties cosponsored the infrastructure initiative.
• The companies cosponsored the technology conference.
• Multiple organizations cosponsored the environmental awareness campaign.