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head-first

adverb
     
head-first , head‧first
1 if you fall headfirst, your head goes down first, and the rest of your body follows afterwards
dive/fall/jump/plunge head-first
I fell head-first down the stairs.
2 if you do something head-first, you become involved in it too quickly, without having time to think about it carefully:
a remark that sent him tumbling head-first into another controversy

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