To save this word, you'll need to log in.
Definition of guard line
2 : a line constituting the inner side of the flangeway of a railroad crossing or switch and comprised of guardrails and wing rails — compare gauge line
Comments on guard line
What made you want to look up guard line? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
A More Exception(al) Quiz
- Which of the following words is not a synonym for ‘a young person’?
Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Share guard line