JACKKNIFE


Meaning of JACKKNIFE in English

■ noun ( plural jackknives )

1》 a large knife with a folding blade.

2》 a dive in which the body is bent at the waist and then straightened.

■ verb ( ~s , jackknifing , ~d )

1》 move (one's body) into a bent or doubled-up position.

↘(of a diver) perform a ~.

2》 (of an articulated vehicle) bend into a V-shape in an uncontrolled skidding movement.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.