Longman Dictionary of Contemporary English homepage

jack-knife

1 noun
     
NEW! See related topics: DAILY LIFE
jack-knife1 plural jack-knives [countable]
1D a knife with a blade that folds into its handle
2 a dive in which you bend at the waist when you are in the air
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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