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jackknife /ˈʤækˌnaɪf/  

  • noun
    plural -knives
    [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
    -knifes; -knifed; -knifing
    [no obj] :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