jack-knife
Longman Dictionary of Contemporary English 5++LDOCE 5++ˈjack-knife1 noun (plural jack-knives) [countable] 1. Da knife with a blade that folds into its handle 折刀2. JUMPa dive in which you bend at the waist when you are in the air 屈体跳水jack-knife2 verb [intransitive] TTCSLIDEif a large vehicle with two parts jack-knifes, it slides out of control and the back part swings towards the front part 〔铰接车辆〕发生弯折 The truck skidded on the ice and jack-knifed. 那辆铰接卡车在冰面上打滑后发生了弯折。→ See Verb table
ˈjack-knife1 nounjack-knife2 verbChineseSyllable
a into Corpus blade handle its with folds that knife a
jack-knife
ˈjack-knife1 
noun (plural jack-knives) [countable]
1. 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
jack-knife2 verb [intransitive]
if a large vehicle with two parts jack-knifes, it slides out of control and the back part swings towards the front part:
The truck skidded on the ice and jack-knifed.
| I |
noun (plural jack-knives) [countable]1. 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
| II |
verb [intransitive]if a large vehicle with two parts jack-knifes, it slides out of control and the back part swings towards the front part: