The word "gage" is a noun that typically means a form of security or a pledge, such as collateral that is given to ensure that a debt or obligation will be fulfilled. It can also refer to a challenge or a test of skill. Full definition
In closing arguments in Manhattan Federal Court, former Senate Majority Leader Dean Skelos» lawyer Robert Gage said his client's three week long criminal trial showed no criminality — just a father trying to help his son. (nystateofpolitics.com)