Significantly, a human being in a normal position would have his or her head above heels, that is, standing upright…so, 'head over heels' simply does not make any sense with its present-day English meaning, unless it refers to someone lying supine with the back of each knee locked under the respective armpit, thus the head would then likely be above each heel, at least most of the time that the person would be looking at what was occurring in her or his crotch, perhaps using that person's own two hands. HEELS OVER HEAD on the other hand makes perfect sense as per the idiom definition of 'completely, thoroughly, all in babe.' Glyph may be related to an expression also used in English,「head over heels: Completely, thoroughly, as in 'They fell head over heels in love.' This expression originated in the 1300s as heels over head and meant literally being upside down. It took its present form in the 1700s and its present meaning in the 1800s.」
　　[　https://idioms.thefreedictionary.com/head+over+heels 2017-07-25 emphasis ours　]　
　「Lying prone with spread feet and crotch」but with the ends of the legs (that is, the feet or what remains of them) positioned above or over the head, beside the ears, FEET INVERTED, EXTREME SPREADING OF GENITALIA, and necessarily PROCEEDING SLOWLY (someone else nearby proceeding most likely, and not necessarily the person lying on his or her back unable to move along the floor). Note that this position is similar to a dog when licking his genitals, that is, his head is placed between his spread hind legs beside his ears.
　Dictionaries also list meanings of prancing feet, but that is not likely while in this position…more likely is that the soles of the feet are facing toward the sky, inverted feet, and the prancing aspect referred to quick actions by a client grasping those feet. Perhaps best accomplished while a human is lying prone, this position may be assumed by bending forward and placing each elbow behind the knee on the same side, wrapping one's hands around the outside of each calf, and then grasping one's ankles while lying back again, often with the assistance of a partner. This position may have been commonly used by a service provider when a client, while squatting above her head, was engaged inside the slits of her no-longer-integrated feet:
　「You don't have to just lie on your back. Wilde recommends lifting your legs as high as possible (we're talking knees on your shoulders here) to help you reach the internal parts of your clitoris…. Now go forth and masturbate a lot! You're ready.」
　　[　https://www.cosmopolitan.com/sex-love/advice/a1602/solo-sex/ 2017-04-28, emphasis ours　]　
　「It's a mighty poor dog that won't wag its own tail…」
　Without a doubt, the Irish also have knowledge of their own to pass along in these trying times:「Masturbation will not spread coronavirus, especially if you wash your hands (and any sex toys) with soap and water for at least 20 seconds before and after.」Nonetheless and regrettably, unlike in dynastic China, it must be undertaken alone to truly be a preventative countermeasure but still achieve the desired result with some degree of safety.
　 　[　https://www.sexualwellbeing.ie/sexual-health/sex-and-coronavirus/ 2020-03-31　]　
　The Dutch, too have the same solution—it seems masturbation has become mainstream in the media the world over due to the coronavirus (it has always been 'the main stream' in reality, albeit covertly for most folks):
　「'Don't have sex with your partner if they have been isolated because of (suspected) coronavirus infection,' the RVIM says. 'Sex with yourself or with others at a distance is possible (think of telling erotic stories, masturbating together).'」
　　[　https://www.theguardian.com/world/2020/may/15/dutch-official-advice-to-single-people-find-a-sex-buddy-for-lockdown-coronavirus 2020-05-16　]　
　Needless to point out perhaps, but Chinese shamans from antiquity hit upon the same solution as a pandemic preventative countermeasure, honed for ultimate client satisfaction by utilizing naked females with no-longer-integrated feet as masturbatory sex buddies available for short-term rental with erotic visualization of live prepubescent female genitalia engaging in autoerotic stimulation herself, as a solution to the same problem facing us now, but in pre-Internet days.

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Chinese: see 夂
Unihan extended: go slowly
EDRDG: winter variant radical (no. 34)