Is it ensure, insure, or assure?
1788 "neat, trim, dainty, small," from Scottish dialectal dink "finely dressed, trim" (c.1500), of unknown origin. Modern sense is 1850s.
To perform successfully, esp after promising; come through: It's a very tough assignment, but he thinks he can deliver/ He talks big, but can he deliver the goods? (1909+)