jackknife - definition and synonyms

verb [intransitive] 

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/ˈdʒækˌnaɪf/
present tense
I/you/we/theyjackknife
he/she/itjackknifes
present participlejackknifing
past tensejackknifed
past participlejackknifed
  1. if a truck or train jackknifes, it bends in the middle and its connected parts fold towards each other