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1. Oxford American Dictionary

   jackknife

   • IPA[ˈjakˌnīf]

   美式

   • n.
     a knife with a folding blade.；a dive in which the body is first bent at the waist and then straightened.
   • v.
     move one's body into a bent or doubled-up position；(of an articulated vehicle) bend into a V-shape in an uncontrolled skidding movement.

   • noun: jackknife, plural noun: jackknives

2. • 釋義

   n.

   名詞

   • 1. a knife with a folding blade.
   • 2. a dive in which the body is first bent at the waist and then straightened.
   • 3. a method of assessing the variability of data by repeating a calculation on the sets of data obtained by removing one value from the complete set.

   v.

   動詞

   • 1. move one's body into a bent or doubled-up position she jackknifed into a sitting position the Major jackknifed his thin body at the waist
   • ▪ (of an articulated vehicle) bend into a V-shape in an uncontrolled skidding movement.
   • ▪ (of a diver) perform a jackknife.