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 | Từ điển Oxford Advanced Learner 8th 
 
	
		|  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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