jack

1 of 2

noun

ˈjak 

plural jacks

1

a

jacks plural in form but singular in construction : a game played with a set of small objects that are tossed, caught, and moved in various figures

b

: a small 6-pointed metal object used in the game of jacks

2

a

: a playing card carrying the figure of a soldier or servant and ranking usually below the queen

b

: jackpot sense 1b(2)

3

: any of various usually mechanical devices: such as

a

: a usually portable mechanism or device for exerting pressure or lifting a heavy body a short distance

b

: a device for turning a spit

4

: a female fitting in an electric circuit used with a plug to make a connection with another circuit

5

a

or less commonly Jack chiefly British : man

—usually used as an intensive

… every man jack in the team will want to impress their new manager.

—Malcolm Macdonald

Those two sessions were both open to the public, which meant that any man Jack from the street could have walked in to watch …

—Neil Ashton

b

or Jack : sailor

c(1)

: servant, laborer

(2)

: lumberjack

6

: something that supports or holds in position: such as

a

: an iron bar at a topgallant masthead to support a royal (see royal entry 1 sense 4) mast and spread the royal shrouds (see shroud entry 1 sense 3a)

b

: a wooden brace fastened behind a scenic unit in a stage set to prop it up

7

a

: any of several fishes

especially : any of various carangids (such as a jack crevalle)

b

: a male donkey

c

: jackrabbit

d

: any of several birds (such as a jackdaw)

8

a

: a small usually white target ball used in lawn bowling or bocce

b

: a small national flag flown by a ship

9

slang : money

10

a

: applejack

b

: brandy

11

: jackknife sense 2

12

: monterey jack

13

US slang : anything at all

—used in negative constructions

In short, Dinger or Homer or whoever it was who wrote the Odyssey didn't know jack about travel.

—Steve Rushin

jack

2 of 2

verb

jacked; jacking; jacks

transitive verb

1

: to move or lift (something) by or as if by a jack (see jack entry 1 sense 3a) : jack up

It meant that we had to jack the aircraft and check out the undercarriage system …

—John Revell

Over 500 tons of pressure was used to jack the legs of the [Gateway] Arch apart for the last four-foot piece to be inserted at the top.

—nps.gov

2

a

: to raise the level or amount of (something) : increase, jack up

The company jacked their rates.

b

: to increase in intensity, scope, etc. : jack up

In the same light, any student has heard of someone taking self-prescribed Adderall to jack their focus for the next big exam.

—Zeno Yeates

3

a

informal : steal

"She jacked my pencil" one boy screamed. "But only because he jacked my pen" the girl yelled back.

—Jason Kane

especially : to steal (a car)

A man is accused of stealing from a Bradenton hardware store and then jacking a nearby car …

—Giuseppe Sabella

b

informal : rob

jack a store

Droopy was always promising to rob old ladies, but so far had jacked only a pizza delivery man …

—Gini Sikes

4

informal : to cause great excitement, enthusiasm, or energy in : jack up

Even Phil Mickelson, the Masters champion of a year ago and a three-time winner in 2005, can't jack the audience like Woods.

—Gerry Dulac

5

: to hunt or fish for (an animal) at night with a jacklight or similar bright light

… if old-fashioned country stores were anything like ours is today, you could find just about any type of gossip you might want, from suspicions about who is jacking deer out of season to the darkest speculation about marital infidelities.

—Cook's Illustrated

6

informal : to copy or appropriate (something, such as an idea or style) : hijack sense 2a

Apparently I'd struck a nerve in that sensitive place called the male ego. In his mind I'd accused him of hip-hop's equivalent of treason—jacking someone's style.

—Dream Hampton

7

informal : to hit (a ball) forcefully

Five batters later Martinez jacked an upper-deck grand slam off Mark Langston …

—Tom Verducci

Big Mac turns it up another notch, jacking five homers in his last 11 at-bats to finish with an unreal 70.

—ESPN

… Mickelson took an aggressive line off the tee and jacked a lob wedge over the green.

—Alan Shipnuck

8

a

informal : to grab, shove, or handle (someone or something) forcefully : jack up

Behind the building he was greeted by several bruisers looking for blood. "One guy jacked my horn out of my arms and threw it down," he [Ornette Coleman] says.

—David Grogan

b

informal : to cause injury to (someone or something) : jack up

The next week, he jacked his knee in a practice incident …, and it set him back a bit.

—racerxonline.com

c

informal : to beat up or hurt (someone) : jack up

Cejudo dropped Cruz with that knee and was jacking him with punches with no real response from Cruz.

—Dan Bernstein

d

informal : to treat or confront (someone) in a harassing, rough, or overly aggressive and typically unwarranted manner : jack up

"I honestly think the only reason I get jacked by the police is because I'm tall and black," said Maurice [St. Cyere], who is 5'9".

—The Bay State Banner

9

vulgar : masturbate, jack off

intransitive verb

: to hunt or fish at night with a jacklight or similar bright light

"… jacking involves the use of a high-powered light and a firearm at night. … Whether you are successful in getting a deer or not, it is an illegal act."

—Blaine Henshaw

jacker noun

see also jacked, jack in, jack into

Synonyms

Noun

• cash
• coin
• money
• currency
• bucks

Verb

• hoist
• heave

Examples of jack in a Sentence

Noun

I'd buy that watch, but I don't have the jack right now.

a Portuguese ship flying the national jack

Verb

jack up the car so we can change that tire

local restaurants jacked up their prices for the summer tourist season

Recent Examples on the Web

Noun

It’s built like a hybrid of the Nintendo Switch Pro and Xbox controller, with offset analog sticks, sturdy triggers, and a headphone jack for added convenience. —Shubham Yewale, PC Magazine, 25 June 2025

Tourists visiting this remote destination can explore its many caves, watch breaching humpbacks (from July through October), go fishing for jacks and tuna offshore, or learn to weave with grasses and palm leaves. —Brianna Randall, Forbes.com, 24 June 2025

Verb

Gold prices slumped in April last year when the Fed started to jack up interest rates in its bid to tame runaway inflation. —Nicole Goodkind, CNN, 12 Jan. 2023

So why not jack up 18 treys in the first half against Kennesaw State at Viejas Arena? —Mark Zeigler, San Diego Union-Tribune, 12 Dec. 2022

Word History

Etymology

Noun

Middle English Jacke, familiar term of address to a social inferior, nickname for Johan John

First Known Use

Noun

1548, in the meaning defined at sense 5a

Verb

1833, in the meaning defined at intransitive sense 2

Phrases Containing jack

• every man jack
• high-low-jack
• jack bean
• jack cheese
• jack crevalle
• jack in
• jack-in-the-box
• jack-in-the-pulpit
• jack into
• jack mackerel
• jack-of-all-trades
• jack-of-all-trades, master of none
• jack off
• jack-o'-lantern
• jack pine
• jack plane
• jack salmon
• jack stand
• jack-tar
• jack up
• jumping jack
• man jack
• new jack
• new jack swing
• pepper jack
• pepper jack cheese
• screw jack
• union jack
• yellow jack

Rhymes for jack

• ack
• brack
• clack
• crack
• dak
• flack
• flak
• hack
• knack
• lac
• lack
• lak

Kids Definition

jack

1 of 2 noun

ˈjak 

1

a

: man entry 1 sense 1a

b

often capitalized : sailor

2

a

: a device for turning a spit (as in roasting meat)

b

: any of various portable devices for applying pressure or lifting a heavy body (as an automobile or a building) a short distance

3

: any of various animals: as

a

: a male donkey

b

: jackrabbit

4

a

: a small national flag flown by a ship

b

: a small six-pointed metal object used in a game

c

plural : a game played with jacks

5

: a playing card bearing the figure of a soldier or servant

6

slang : money sense 1a

7

: a socket used with a plug to connect one electric circuit with another

jack

2 of 2 verb

1

: to move or lift by or as if by a jack

2

: increase entry 1 sense 1, raise

jack up prices

jacker noun