variants:
or co-sponsor
plural cosponsors or co-sponsors
Definition of cosponsor
: a joint sponsor
The senator was a cosponsor for both bills. Michigan Tech Student Relay For Life is a participating cosponsor of this event. — The Daily Mining Gazette
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Merriam-Webster unabridged
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Time Traveler for cosponsor
The first known use of cosponsor was in 1849
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