jackknife

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jack·knife

BrE

/ˈdʒæknaɪf/

NAmE

/ˈdʒæknaɪf/

noun

(

jack·knives

BrE

/ˈdʒæknaɪvz/

NAmE

/ˈdʒæknaɪvz/

)

a large knife with a folding blade 大折刀

jack·knife

BrE

/ˈdʒæknaɪf/

NAmE

/ˈdʒæknaɪf/

verb

present simple - I / you / we / they

jackknife

BrE

/ˈdʒæknaɪf/

NAmE

/ˈdʒæknaɪf/

present simple - he / she / it

jackknifes

BrE

/ˈdʒæknaɪfs/

NAmE

/ˈdʒæknaɪfs/

past simple

jackknifed

BrE

/ˈdʒæknaɪft/

NAmE

/ˈdʒæknaɪft/

past participle

jackknifed

BrE

/ˈdʒæknaɪft/

NAmE

/ˈdʒæknaɪft/

-ing form

jackknifing

BrE

/ˈdʒæknaɪfɪŋ/

NAmE

/ˈdʒæknaɪfɪŋ/

[intransitive]

to form a V-shape. For example if a lorry/truck that is in two parts jackknifes, the driver loses control and the back part moves towards the front part. 弯成 V 字形（如铰接货车失控时的弯折）