jackknife
jack
ˈʤæk
jāk
knife
naɪf
naif
/d‌ʒˈækna‌ɪf/

Definition & Meaning of "jackknife"in English

Jackknife
01

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

Grammatical Information
animacy status
inanimate
plural form
jackknives
02

a large knife with one or more folding blades

to jackknife
01

contrary to rule or accepted order or general practice

Grammatical Information
action verb
regular
present tense
jackknife
3rd person singular
jackknifes
past simple
jackknifed
past participle
jackknifed
02

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

03

(of articulated vehicles such as tractor trailer) to experience a loss of control where the front and rear parts of the vehicle fold together

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