head over heels
1a. In a somersault; upside down; head first.
It was so dark Bob fell head over heels into a big hole in the ground.
Compare: UPSIDE DOWN.
1b. In great confusion or disorder; hastily.
The children all tried to come in the door at once, head over heels.
Compare: TOPSY-TURVY.
2. {informal}
Completely; deeply.
He was head over heels in debt.
She was head over heels in love.
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Source: A Dictionary of American Idioms