a small worthless amount; "you don't know jack"
Used in a Sentence
jack
How to use jack in a sentence. Example sentences and definitions for jack.
Editorial note
We know jack about how the vast majority of biology works.
Examples4
Definitions14
Parts of speech2
Quick take
a small worthless amount; "you don't know jack"
Meaning at a glance
The clearest senses and uses of jack gathered in one view.
a man who serves as a sailor
someone who works with their hands; someone engaged in manual labor
Definitions
Core meanings and parts of speech for jack.
noun
a small worthless amount; "you don't know jack"
noun
a man who serves as a sailor
See also: mariner, seaman, tar, Jack-tar, Jack, seafarer, gob
noun
someone who works with their hands; someone engaged in manual labor
noun
immense East Indian fruit resembling breadfruit; it contains an edible pulp and nutritious seeds that are commonly roasted
noun
a small ball at which players aim in lawn bowling
noun
an electrical device consisting of a connector socket designed for the insertion of a plug
noun
game equipment consisting of one of several small six-pointed metal pieces that are picked up while bouncing a ball in the game of jacks
See also: jackstones
noun
small flag indicating a ship's nationality
noun
one of four face cards in a deck bearing a picture of a young prince
See also: knave
noun
tool for exerting pressure or lifting
noun
any of several fast-swimming predacious fishes of tropical to warm temperate seas
noun
male donkey
See also: jackass
verb
lift with a special device; "jack up the car so you can change the tire"
verb
hunt with a jacklight
See also: jacklight
Example sentences
We know jack about how the vast majority of biology works.
It sounds like such a great idea, but the reality is that fully covered tuition means jack shit when they are working 70-80 hours a week just to make rent and keep the lights on.
It is a writing contest, and you can be sure that the Federal contract officer knows jack shit about the actual fundamentals of the project.
But even the prudent ones will be trying to jack up their salaries because there are SO many things you are supposed to save for to be considered a responsible American adult.
Frequently asked questions
Short answers drawn from the clearest meanings and examples for this word.
How do you use jack in a sentence?
We know jack about how the vast majority of biology works.
What does jack mean?
a small worthless amount; "you don't know jack"
What part of speech is jack?
jack is commonly used as noun, verb.