headfirst

形容词 headfirst:

1. with the head foremost
   同义词：headlong

副词 headfirst:

1. with the head foremost
   同义词：headlong

1. A dive executed by jumping headfirst, bending the body at the waist, and, with the legs straight, touching the feet with the hands before straightening out to enter the water hands first.
   屈体跳水，镰刀式跳水头向下的一种跳水动作，把身体弯到腰部、腿伸直，在打开身体且以手先触水的姿势跳入水中以前，要先用手触脚

head.first

adv.（副词）
With the head leading; headlong:
头部在先地；头朝前地：
例句：
went headfirst down the stairs.
一头栽下了楼梯

Impetuously; brashly.
鲁莽地；轻率地

【引伸】
head.first.
adj.（形容词）