Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

jack line

noun

Definition of jack line 

1 : a small rope or line

2 : a rod or steel cable connecting a central pumping engine with each of two or more oil wells which it powers

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for jack line

jack entry 1 (something smaller)

Keep scrolling for more

Learn More about jack line

Dictionary Entries near jack line

jackleg

jacklight

jacklighter

jack line

jack mackerel

jackman

jack mormon

Statistics for jack line

Look-up Popularity

Comments on jack line

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

Show Comments  Hide Comments 

WORD OF THE DAY

linchpin

one that holds something together

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Roman Mythology Quiz

  • the-triumph-of-venus-by-alessandro-magnasco
  • Boreal comes from the name of the ancient Greek god of which wind?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

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!

Words at Play

Ask the Editors

Word Games