Definition of headfirst
- dove headfirst into the waves
She dove into the water headfirst.
She rushed into the relationship headfirst.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'headfirst.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
: with the head leading
: without taking time to think about your actions
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