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Wiktionary
co-sign

vb. (alternative form of cosign English)

WordNet
co-sign
  1. v. sign jointly; "Husband and wife co-signed the lease" [syn: cosign]

  2. sign and endorse (another person's signature), as for a loan [syn: cosign]

Wikipedia
Co-Sign (song)

"Co-Sign" is a song by American R&B group SWV, released on December 15, 2011, by Mass Appeal Entertainment and E1 Music. The song is the first single for the group since 1998's " Rain" and was intended to launch their mainstream comeback. A music video for the single was filmed in Atlanta on January 25, 2012, and was officially released February 21, 2012 on AOL Music's TheBoomBox.com. It is the first single from SWV's comeback album I Missed Us.

Usage examples of "co-sign".

Boyd co-signed Littell’s Pension Fund hard-on--which meant at least an outside chance at co-opting big money.

He co-signed a mortgage, and when he found out that the girl was seeing one of my officers, he told the bank he would no longer guarantee payment.

A dinkum comrade, Foo Moses Morris, co-signed much paper to keep us going—and wound up broke and started over with a little tailoring shop in Kongville.

A dinkum comrade, Foo Moses Morris, co-signed much paper to keep us going--and wound up broke and started over with a little tailoring shop in Kongville.

As I’ve mentioned, Uncle Raymond and Gabe Crawford co-signed a note for $10,000 to get me started, and I began to raise money, at first mostly in the Fayetteville area, then across the district and eventually throughout the state.