jackknife
jack·knife [jackknife jackknives] noun, verb BrE [ˈdʒæknaɪf] NAmE [ˈdʒæknaɪf]
noun (pl. jack·knivesBrE [ˈdʒæknaɪvz] ; NAmE [ˈdʒæknaɪvz] )
a large knife with a folding blade
verb 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.
Verb forms: 
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