jackknife

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jack·knife

 (jăk′nīf′)
n.
1. A large clasp knife.
2. Sports A dive in the pike position, in which the diver straightens out to enter the water hands first.
v. jack·knifed, jack·knif·ing, jack·knifes
v.tr.
1. To fold or double (something or oneself) like a jackknife.
2. To cut or stab with a jackknife.
v.intr.
1. To bend or fold up like a jackknife: A truck that had jackknifed was blocking the road.
2. To form a 90° angle.

jackknife

(ˈdʒækˌnaɪf)
n, pl -knives
1. (Tools) a knife with the blade pivoted to fold into a recess in the handle
2. (Swimming, Water Sports & Surfing) a former name for a type of dive in which the diver bends at the waist in midair, with the legs straight and the hands touching the feet, finally straightening out and entering the water headfirst: forward pike dive
vb (intr)
3. (Automotive Engineering) (of an articulated lorry) to go out of control in such a way that the trailer swings round at an angle to the cab
4. (Swimming, Water Sports & Surfing) to make a jackknife dive

jack•knife

(ˈdʒækˌnaɪf)

n., pl. -knives, n.
1. a large pocketknife.
2. a dive in which the diver bends in midair to touch the toes, keeping the legs straight, and then straightens out.
v.i.
3. to bend over from or at the middle; double over like a jackknife.
4. (of a trailer truck) to have the cab and trailer swivel at the linkage until they form a Vshape, as the result of an abrupt stop or accident.
5. (in diving) to perform a jackknife.
v.t.
6. to cause to jackknife.
7. to cut with a jackknife.
[1705–15, Amer.]

jackknife


Past participle: jackknifed
Gerund: jackknifing

Imperative
jackknife
jackknife
Present
I jackknife
you jackknife
he/she/it jackknifes
we jackknife
you jackknife
they jackknife
Preterite
I jackknifed
you jackknifed
he/she/it jackknifed
we jackknifed
you jackknifed
they jackknifed
Present Continuous
I am jackknifing
you are jackknifing
he/she/it is jackknifing
we are jackknifing
you are jackknifing
they are jackknifing
Present Perfect
I have jackknifed
you have jackknifed
he/she/it has jackknifed
we have jackknifed
you have jackknifed
they have jackknifed
Past Continuous
I was jackknifing
you were jackknifing
he/she/it was jackknifing
we were jackknifing
you were jackknifing
they were jackknifing
Past Perfect
I had jackknifed
you had jackknifed
he/she/it had jackknifed
we had jackknifed
you had jackknifed
they had jackknifed
Future
I will jackknife
you will jackknife
he/she/it will jackknife
we will jackknife
you will jackknife
they will jackknife
Future Perfect
I will have jackknifed
you will have jackknifed
he/she/it will have jackknifed
we will have jackknifed
you will have jackknifed
they will have jackknifed
Future Continuous
I will be jackknifing
you will be jackknifing
he/she/it will be jackknifing
we will be jackknifing
you will be jackknifing
they will be jackknifing
Present Perfect Continuous
I have been jackknifing
you have been jackknifing
he/she/it has been jackknifing
we have been jackknifing
you have been jackknifing
they have been jackknifing
Future Perfect Continuous
I will have been jackknifing
you will have been jackknifing
he/she/it will have been jackknifing
we will have been jackknifing
you will have been jackknifing
they will have been jackknifing
Past Perfect Continuous
I had been jackknifing
you had been jackknifing
he/she/it had been jackknifing
we had been jackknifing
you had been jackknifing
they had been jackknifing
Conditional
I would jackknife
you would jackknife
he/she/it would jackknife
we would jackknife
you would jackknife
they would jackknife
Past Conditional
I would have jackknifed
you would have jackknifed
he/she/it would have jackknifed
we would have jackknifed
you would have jackknifed
they would have jackknifed
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.jackknife - a large knife with one or more folding blades
pocket knife, pocketknife - a knife with a blade that folds into the handle; suitable for carrying in the pocket
2.jackknife - a dive in which the diver bends to touch the ankles before straightening out
dive, diving - a headlong plunge into water
Verb1.jackknife - dive into the water bending the body at the waist at a right angle, like a jackknife
athletics, sport - an active diversion requiring physical exertion and competition
dive - plunge into water; "I was afraid to dive from the board into the pool"
Translations

jackknife

[ˈdʒæknaɪf]
A. N (jackknives (pl)) → navaja f, chaveta f (LAm)
B. VI [lorry] → colear
C. CPD jackknife dive Nsalto m de la carpa, carpa f

jackknife

[ˈdʒæknaɪf] ncouteau m de poche

jackknife

n
(großes) Taschenmesser
(also jackknife dive)gehechteter Sprung
vi the lorry jackknifedder Lastwagenanhänger hat sich quer gestellt
References in classic literature ?
The black strips at the end of each nail, Martin pared off with his jackknife.
Then I am to take it that Monsieur Tarzan would prefer to go naked into the jungle, armed only with a jackknife, to kill the king of beasts," laughed the other, good naturedly, but with the merest touch of sarcasm in his tone.
Then he gave Jack a sudden push that sent him sprawling upon the cushions in so awkward a fashion that he doubled up like a jackknife, and had hard work to untangle himself.