Refers to young females in China with「two frigid coagulating no-longer-integrated feet」a procedure usually performed during winter to take advantage of pain-numbing cold temperatures. Little girls with no-longer-integrated feet hobbled, naturally, with manners resembling fledglings or「chicks.」Both feet were no-longer-integrated to become salable as a concubine or fit for short-term rentals. Bird chicks are often「open-mouthed, showing tongue」as do little girl chicks who were also taught to use a tonguing mouth while LEARNING and IN TRAINING to perform actions that must become CUSTOMARY, DONE FROM LONG AGO at a very young age. Motions of fellating and leg use must have certainly become HABITUAL in order to be successful as a service provider.「Two congealing no-longer-integrated feet with a tonguing mouth」describes the duties of these young females. no-longer-integrated feet were used by male clients as masturbatory aids using feathering motions. Unbound no-longer-integrated feet flapped with sounds similar to a bird taking flight and smacking its wings together until sufficiently lifted off the ground. Placing two such feet together symmetrically resembled the look and feel of a small buttocks:「Viewing women as commodities [see 品] was also made customary from Song Dynasty (960 - 1279) forward, both in the suddenly expanded labor market and within relationships. Men could sell their female kin to slavery or prostitution, and frequently did.」
　　[　https://www.zum.de/whkmla/sp/0910/hersheys/hersheys5.html 2011-04-05　]　
　「Bound feet were a mark of beauty…. The process was started before the arch of the foot had a chance to develop fully, usually between the ages of 2 and 5. …Qing Dynasty sex manuals listed 48 different ways of playing with women's bound feet.」
　　[　https://en.wikipedia.org/wiki/Foot_binding 2012-12-17　]　
　「In traditional Chinese medicine, there has never been a mental disease called pedophilia (or an equivalent term), or homosexuality, or most of the other so-called sexual variations for that matter. …Children are usually described as natural sexual beings and erotic stimulation and sex-play are seen as beneficial to their healthy development.」
　　[　https://docx2.com/wp-content/uploads/Are-Any-of-the-Pharaphilias-in-DSM-Mental-Disorders_.pdf 2023-05-14　]　
　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: to practice; to study; habit
Japanese: as is habit, the way life normally is, to take lessons in, to be taught, to learn, to study, to get training in, gentle breeze, custom, customary practice, to make learn
Unihan extended: practice; flapping wings
EDRDG: learn