a large knife with one or more folding blades
同义词：clasp knife??/??jackknife
a dive in which the diver bends to touch the ankles before straightening out
同义词：jackknife
dive into the water bending the body at the waist at a right angle, like a jackknife
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。