1
general::
A perfect achievement, as in Tim scored a hole in one on that test. The term alludes to a perfect stroke in golf, where one drives the ball from the tee into the hole with a single stroke. [c. 1900]
American Heritage Idioms
2
general::
Phrase(s): hole in one
1. Lit. an instance of hitting a golf ball from the tee to the hole in only one try. (From the game of golf.) • John made a hole in one yesterday. • I’ve never gotten a hole in one. 2. Fig. an instance of succeeding the first time. • It worked the first time I tried it—a hole in one. • Bob got a hole in one on that sale. A lady walked in the door, and he sold her a car in five minutes.
McGrawhill's American Idioms And Phrasal Verbs