jack Definition
jack (jak)
noun pl. jacks, jack
- John
- Obsolete a common fellow or boy assistant
- a man or boy; fellow: sometimes used as a slang form of address
- Now Rare a sailor; jack-tar
- ☆ a lumberjack
- a jack-of-all-trades
- a fruit-flavored alcoholic liquor, as applejack
- any of various machines used to lift, hoist, or move something heavy a short distance hydraulic jack, automobile jack
- a wooden bar attached to each key of a harpsichord, etc. that raises the plectrum when the key is depressed
- a male donkey; jackass
- ☆ jack rabbit
- any of various birds, as a jackdaw
- any of a tropical, marine family (Carangidae) of predatory, silvery, percoid, game and food fishes with widely forked tails, including the pompanos and yellowtails
- jackfish
- ☆ Slang money
- Elec. a plug-in receptacle used to make electrical contact
- Games
- a playing card with a conventionalized picture of a royal male servant or soldier on it; knave
- a small ball used as the center mark in lawn bowling
- any of the small stones or six-pronged metal pieces used in playing jacks
- ☆ Hunting a torch or light used to attract fish or game at night
- Naut. a small flag usually flown on a ship's bow to show nationality, often, specif., union jack
Etymology: ME Jacke, Jake < OFr Jaque, Jaques < LL(Ec) Jacobus, Jacob
transitive verb
- to raise by means of a jack
- ☆ to hunt or fish for with a light
adjective
male: of some animals
jack Idioms
every man jack
every man; everyone
jack around
☆ Slang- to spend time in useless activity
- to trifle or meddle (with)
- to harass, treat with contempt, etc.
jack off
Slang to masturbate: used chiefly of males
jack up
- to raise by means of a jack
- ☆ Informal to raise (prices, salaries, etc.)
- ☆ Informal
- to reproach for misbehavior or neglect
- to encourage to perform one's duty
jack Synonyms
jack
n.
An instrument for elevating
jackscrew, ratchet, jack, automobile jack, pneumatic jack, hydraulic jack; see also device 1, tool 1.The male of certain animals
every man jack
jack Telecom Definition
jack Usage Examples
Converse of object
jump: Running works great, running backward, jumping side steps, jumping in place, jumping jacks, things like that.
Preposition: for
listening: A headphone jack for private listening is included in the design.
Adjective modifier
- 3.5mm: Connectivity on the receiver is offered either via a 3.5mm phono jack or a pair of standard phono cables.
- hydraulic: I use a laboratory jack for vertical movement having toyed with a small car hydraulic jack.
- 2.5mm: Connects to radio via 3.5mm & 2.5mm mono jacks.
- stereo: Line Socket: RCA Phono Phones Socket: 3.5mm stereo jack Cable Length: 3m supplied, extensions available up to 100m.
- rj-11: That's right, the Duo has an RJ-45 jack for the integrated NT-1 ISDN U interface, plus an RJ-11 telephone jack.
- black: Or I am sitting in Las Vegas playing black jack listening to my stuff.
Modifies a noun
- plug: Particularly little screws in jack plugs, mains plugs, IEC connectors.
- snipe: The love-song of the common jack snipe seemed not a whit less mysterious than partridge drumming.
- socket: Attach a switch to the jack socket on the front on the unit.
- pike: The latter was followed to the net by a jack pike of similar size!
- hammer: It would probably be worth hiring a jack hammer for the job.
- connector: The other side of the battery box may have XLR or 1/4 " jack connectors.
Noun used with modifier
- headphone: Plug a tape recorder into the headphone jack of the computer with a double plug cord.
- union: Rating: UNION JACK · New series · Vol.
- headset: An integrated headset jack allows for flexible and easy headphone use.
- trolley: When using a trolley jack, refer to the vehicle workshop manual to identify the correct lifting point.
- rj: They like a personal lines customers just a good an rj jack.
- phono: Connectivity on the receiver is offered either via a 3.5mm phono jack or a pair of standard phono cables.

