jackknife

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1 jackknife /ˈʤækˌnaɪf/ noun
plural jackknives
1 jackknife
/ˈʤækˌnaɪf/
noun
plural jackknives
Learner's definition of JACKKNIFE
[count]
: a small knife that has a folding blade : pocketknife
: a dive in which you bend from the waist and touch your ankles and then straighten out
2 jackknife /ˈʤækˌnaɪf/ verb
jackknifes; jackknifed; jackknifing
2 jackknife
/ˈʤækˌnaɪf/
verb
jackknifes; jackknifed; jackknifing
Learner's definition of JACKKNIFE
[no object]
: to bend in the middle like a folding jackknife
especially of a large truck : to have the back part slide out of control toward the front part
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