—jackknife /ˈdʒæk.naɪf/
noun [C] (PLURAL jackknives)
► F0 a large knife with a blade that folds into the handleThesaurus+: ↑Hand weapons , ↑Handguns and riflesverb [I] ↑Verb Endings for jackknife
► F0 If a truck that has two parts jackknifes, one part moves around so far towards the other part that it cannot be driven: » The oil tanker jackknifed after skidding on the ice.See picture: jack-knifed lorry 
Thesaurus+: ↑Accidents involving vehicles
- ♯ Tearing and breaking into pieces
- ♯ Teasing
- ♯ Technical music terms
- ♯ Technology
- ♯ Tedious and uninspiring
- ♯ Telephone equipment
- ♯ Television
- ♯ Temporary
- ♯ Tender and gentle
- ♯ Tennis and racket sports
- ♯ Terminology and vocabulary
- ♯ Terms for location and direction used at sea
- ♯ Terms for numbers
- ♯ Territorial boundaries
- ♯ Terrorism and political crime
- ♯ Testing, checking and experimenting
- ♯ Textiles and fabrics
- ♯ Textiles made from man-made fibres
- ♯ Textiles made from natural fibres
- ♯ The Air Force
- ♯ The arm
- ♯ The armed forces generally
- ♯ Theatre auditorium and front-of-house
- ♯ Theatre - general words
- ♯ Theatres, cinemas and their parts