Definition of co-sign in English:

co-sign

Syllabification: co-sign
Pronunciation: /ˈkōˌsīn/

Entry from US English dictionary

verb

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
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

Definition of co-sign in:

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Word of the day setose
Pronunciation: ˈsiːtəʊs
adjective
bearing bristles or setae; bristly