Definition of Jackknife in English :

Define Jackknife in English

Jackknife meaning in English

Meaning of Jackknife in English

Pronunciation of Jackknife in English

Jackknife pronunciation in English

Pronounce Jackknife in English


see synonyms of jackknife


1. clasp knife, jackknife

a large knife with one or more folding blades

2. jackknife

a dive in which the diver bends to touch the ankles before straightening out


3. jackknife

dive into the water bending the body at the waist at a right angle, like a jackknife

WordNet Lexical Database for English. Princeton University. 2010.


see synonyms of jackknife
noun plural -knives
a knife with the blade pivoted to fold into a recess in the handle
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
verb (intransitive)
(of an articulated lorry) to go out of control in such a way that the trailer swings round at an angle to the cab
to make a jackknife dive

Collins English Dictionary. Copyright © HarperCollins Publishers


see synonyms of jackknife
nounWord forms: plural ˈjackˌknives (ˈdʒækˌnaɪvz ; jakˈnīvzˌ)
a large pocketknife
a dive in which the diver keeps his knees unbent, touches his feet with his hands, and then straightens out just before plunging into the water
verb transitiveWord forms: ˈjackˌknifed or ˈjackˌknifing
to cut with a jackknife
to cause to jackknife
verb intransitive
to bend at the middle as in a jackknife dive
to turn on the hitch so as to form a sharp angle with each other
said of a vehicle and its trailer

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.


see synonyms of jackknife
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
1. To fold or double (something or oneself) like a jackknife.
2. To cut or stab with a jackknife.
1. To bend or fold up like a jackknife: A truck that had jackknifed was blocking the road.
2. To form a 90° angle.

The American Heritage ® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.