Headfirst (adverb)

With the head going in first, as in diving or sliding into a base in baseball.

Origin:

Compound word made up of "head" and "first".

Examples:

1. He dove headfirst into the pool.
2. She slid headfirst into second base.
3. The child went down the slide headfirst.
4. He threw himself headfirst into the task at hand.
5. She dove headfirst into the book, reading for hours.