Longman Dictionary of Contemporary English
Wiktionary
adv. With the head first or foremost. alt. With the head first or foremost.
Usage examples of "head-first".
X forced him there-poor Babygirl spread-eagled and helpless bleeding from a thousand welts and lacerations made by his claws and teeth and why was he being forced snout-first, and then head-first, then his shoulders, his sleek muscular length, why there-in there-so he choked, near-suffocated, used his teeth to tear a way free for himself yet even as he did so Mr.
Before the half-vampaneze or Gannen Harst could react, Mr Crepsley seized the Lord by the scruff of his shirt with his left hand, grabbed the waist of his trousers with his right, lifted him off the floor, spun to the edge of the platform — and tossed him head-first over the side, into the pit of stakes below!
It caught her a sweeping blow, and being off balance like she was, she went down the stairs head-first.
Baker mumbled after he'd unstrapped and promptly collided head-first with the ceiling.