a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

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World English Dictionary

headfirst (ˈhɛdˈfɜːst)

—*adj, —adv*
1.	with the head foremost; headlong: he fell headfirst

—*adv*
2.	rashly or carelessly

Collins English Dictionary - Complete & Unabridged 10th Edition
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