hole in one
hole in one definition by American Heritage Dictionary
noun pl. holes in oneThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The driving of a golf ball from the tee into the hole in a single stroke.
hole in one - Phrases/Idioms
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]