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to dive in headfirst
01
to decide to do something without considering its consequences
![to [dive] in headfirst definition and meaning](https://cdn.langeek.co/photo/46316/original/?type=jpeg "to [dive] in headfirst definition and meaning")
Idiom
Informal
Example
Tony accepted the project without realizing how much time it would take; he always dives in headfirst!
She did n't hesitate to dive in headfirst when she was offered a leadership role in the project.
