IdiomBody & SensesEnglish

head over heels in love

Meaning: Very much in love; uncontrollably in love.

Example: “They met on a train and were head over heels in love within a week.”

Origin: Originally the opposite way around: "heels over head" is on record from the 1300s, describing a literal somersault or cartwheel — heels flung up above where the head normally is, the obviously upside-down state. During the 1700s the phrase flipped to "head over heels," which, taken completely literally, describes the ordinary, right-side-up way a body is arranged the rest of the time; the wording no longer makes logical sense on its own; but as the wording flipped, the meaning had already shifted with it, from "upside down" to "totally, completely," which is what carried through into the 1800s pairing with "in love" — someone so overtaken by the feeling that they might as well have been tumbled head over heels by it.

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