1 jackknife /ˈʤækˌnaɪf/ noun plural jackknives
plural jackknives
Learner's definition of JACKKNIFE
[count]
1
: a small knife that has a folding blade : pocketknife 小折刀 2
: a dive in which you bend from the waist and touch your ankles and then straighten out屈体跳水；镰刀式跳水
2 jackknife /ˈʤækˌnaɪf/ verb
jackknifes; jackknifed; jackknifing
2 jackknife
/ˈʤækˌnaɪf/
verb
jackknifes; jackknifed; jackknifing
Learner's definition of JACKKNIFE
[no object]
: to bend in the middle like a folding jackknife
especially of a large truck : to have the back part slide out of control toward the front part（大货车失控时驾驶室与后半部车体间）弯折成V形