jump headfirst

Translations
прыгать головой вперед
He jumped headfirst into the water.
Он прыгнул головой вперед в воду.
Definitions
To dive or plunge into something with one's head leading, often used metaphorically to describe engaging in an activity or situation with enthusiasm and without hesitation.
Words
jump

verb
прыгать
headfirst

adverb
вниз головой