Dictionary

headfirst

adverb head·first \ˈhed-ˈfərst\

: with the head leading

: without taking time to think about your actions

Full Definition of HEADFIRST

1
:  with the head foremost <dove headfirst into the waves>
2
:  headlong 2
headfirst adjective
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First Known Use of HEADFIRST

circa 1828
HEADFIRST Defined for Kids

headfirst

adverb head·first \ˈhed-ˈfərst\

Definition of HEADFIRST for Kids

:  with the head in front <He fell headfirst down the stairs.>

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