Verb
sign and endorse (another person's signature), as for a loan
sign jointly
Source: WordNetI don't belong to any club or group. I don't fish, cook, dance, endorse books, sign books, co-sign declarations, eat oysters, get drunk, go to church, go to analysts, or take part in demonstrations. Vladimir Nabokov
Jay gave me a co-sign like I was RocaWear, but be clear I'm not the air/heir I'm the water, fire and the earth That means I'm doing dirt, spitting flames and quenching thirst. Lupe Fiasco
I hope to one day co-sign a lease with another person but, well, it doesn't plague me that I have yet to do so. Put it this way: I've never had to violently tug at my own pillow at 2 A.M. to get myself to stop snoring. Sloane Crosley
Husband and wife co-signed the lease Source: Internet
Lindelof, Pizzolatto’s unofficial HBO brother-in-arms, seemed to co-sign the creator’s pitch in his own Instagram post. Source: Internet
You also represent a very troubling trend: Whenever FAKE NEWS offends black folks by doing what they do, they trot out folks like you to make A-merry-cans think that we (Black folks) co-sign with their bull shit. Source: Internet