(someone) goes headfirst into (something)

Translations
(кто-то) погружается с головой в (что-то)
She went headfirst into her new job.
Она с головой погрузилась в свою новую работу.
Definitions
This phrase means that someone starts doing something with a lot of enthusiasm, energy, or commitment, often without hesitation or careful planning. It suggests diving into an activity or situation quickly and wholeheartedly.
Words
someone

pronoun
кто-то
goes

verb
идёт
headfirst

adverb
очертя голову
into

preposition
в
something

pronoun
что-то