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1sign (a document) in order to guarantee a loan or other obligation: [with object]: co-sign a loan [no object]: see if your parents will co-sign for you
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2 [with object] designate with two different labels or signs: original interchange numbers will be co-signed with new numbers for two years after the conversion U.S. 400 is co-signed with U.S. 166 for about 8 miles