nail down

phrasal verb

Definition of nail down

1 : to make (something, such as a victory) certain to happen They need to score another touchdown to nail down the victory.
2 : to find out or identify (something) exactly Her doctors haven't yet been able to nail down a diagnosis. They're trying to nail down the cause of our network problems.
3 : to make (something) definite or final nail down a decision

Learn More about nail down

Share nail down

Statistics for nail down

Look-up Popularity

More from Merriam-Webster on nail down

Nglish: Translation of nail down for Spanish Speakers

Comments on nail down

What made you want to look up nail down? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to boil down or concentrate

Get Word of the Day daily email!

Test Your Vocabulary

Original Meanings Quiz

  • rembrandt-painting-a-young-scholar-and-his-tutor
  • Which of the following is the earliest known sense of the word awe?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!