head first

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1. Literally, with one's head at the forefront; leading with one's head. He tripped on a crack in the pavement and fell headfirst down a manhole.
2. By extension, recklessly, brashly, or thoughtlessly. Before you go rushing headfirst into some half-baked business venture with these guys, take a minute and think about whether something like this could actually work. My brother was forever going headfirst into really serious relationships that would suddenly fizzle out a few months later.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

ˌhead ˈfirst

1 moving forwards or downwards with your head in front of the rest of your body: He fell head first down the stairs.
2 without thinking carefully about something before acting: She got divorced and rushed head first into another marriage.
See also: first, head
Farlex Partner Idioms Dictionary © Farlex 2017
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References in classic literature ?
He must be able to spring from the floor to about twice his own height, gradually turning over as he rises, so as to come down again head first."
The shaggy man flew after them, head first, and lighted in a heap beside Toto, who, being much excited at the time, seized one of the donkey ears between his teeth and shook and worried it as hard as he could, growling angrily.
Peter fell down head first; but it was of no consequence, as the bed below was newly raked and quite soft.
'Now then,' cried he, 'let me ascend quickly.' As he began to put himself into the sack heels first, 'Wait a while,' said the gardener, 'that is not the way.' Then he pushed him in head first, tied up the sack, and soon swung up the searcher after wisdom dangling in the air.
As he was thus bending down into it the woman suddenly rose up and pushed him in head first, saying that now he could take up his quarters there.
As soon as she came to the river she lay down to take a drink of the water, but meanwhile the two of them had got down off the roof and thrust her, head first, into the river.
They had a large canvas bag, which tied up at the mouth with strings: into this they slipped the guinea-pig, head first, and then sat upon it.)
"Now, fifty dollars gold 'd buy beer to beat the band--enough to drown me if I fell in head first. Yet I want to ask you one question.
I made a little spring and the straw slipped from under my feet and there I was going head first down from the loft.
She plunged head first on to the ice and he stumbled and crashed on top of her.
Though it was only a two-story fall, because he fell head first, he suffered severe head trauma.
Then one firefighter dangled head first into the machine, grabbed the boy and passed him to another firefighter.
Refer to the department head first before issuing any notices to safeguard the good name of the department,' he said of the worker.
"At about 4.30pm he was leaving via the Bear and Clarence Bridge when he tripped over the parapet wall on his left hand side, fell head first into the moat, and thereby suffered fatal head injuries," Lord Justice Gross told London's Appeal Court.
As with other works in the Head First series, this volume is designed for readers that benefit from more visual approaches to learning, and the guide is filled with illustrations, cartoons, hand drawn charts, and photographs.