Definition of blue line
: either of two blue lines that divide an ice hockey rink into three equal zones and that separate the offensive and defensive zones from the center-ice neutral zone
Keep scrolling for more
Test Your Vocabulary
Slippery Words Quiz—Changing with the Times
- What is an earlier meaning of nice?

Test your visual vocabulary with our 10-question challenge!
TAKE THE QUIZ
Spell words. Make bears.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
Share blue line
Time Traveler for blue line
The first known use of blue line was in 1925
See more words from the same year