To say that a person is “responsible” means that he is able to pay a sum for which he is or may become liable, or to discharge an obligation which he may be under. Farley v. Day. 20 N. H. 531; People v. Kent, 100 111. 655, 43 N. E. 700; Com. v. Mitchell. 82 Pa. 349. A promise to be “responsible” for the contract of another is a guaranty rather than a suretyship. Bickel v. Auner, 9 Phila. (Pa.) 499.