headfirst   (Sound)

The headfirst has 2 Senses.

• headlong, headfirst
• with the head foremost; "the runner slid headlong into third base"
• 頭を先にして

• headfirst, headlong
• with the head foremost; "a headfirst plunge down the stairs"; "a headlong dive into the pool"
• 真っ逆さまに