Since antiquity (apparently), the expression「tiger's stomach」has referred to the appearance of a woman's abdominal SKIN full of stripes caused by stretch marks formed while in late-term pregnancy, which is evidently the most obvious presentation of SKIN anyone could make, anywhere in the world. The area around a tiger's stomach is covered by a remarkably large, loose flap of hanging skin, capable of expanding while it is feeding, and resembles the flap of stomach skin on most women immediately after giving birth. Lowermost element is「flesh, meat」and「filled orifice」(referring to pregnancy, perhaps) but may also have been「extraction, reason, cause」another possible reference to pregnancy and her「stomach filled with meat (…the fetus, folks) as the cause」of her tiger's skin. The SKIN, the body's largest organ, is also「filled with meat.」Tigers were prized for their SKIN and hunted as trophies for that reason, so in China if you had「tiger in your stomach」then its skin was on your wall or floor, perhaps.
　All that aside,「prepubescent girls divine, raised rod with rolled skin, erection and service provider with meat plugging orifice」as a series of clients who used the deboned meaty feet skin sacks of a Chinese service provider as masturbatory aids plugging those surrogate orifices…refers to ejaculated drops of semen and other discharges that would accumulate and dry upon the stomach skin of the supine female, often creating long stripes as it fully liquefied and then ran in a long trail down her torso, altering the surface texture until scraped and cleansed prior to the next session. The GRAIN refers both to the dried droplet trails and those「other discharges」with 'grain' also as the Chinese euphemism for drops of gonorrheal gleet. Obviously, such a sight upon arrival of the succession of later clientele would alter the temperament and mood, FRAME OF MIND of each client (the service providers themselves soon became inured). Formerly 臚,「meat with tigress captives, troublesome blobs, fussy, sticky black netting on tray」depicting abdominal SKIN covered by what appeared to be netting.
　「Qing Dynasty sex manuals listed 48 different ways of playing with women's [no-longer-integrated] bound feet」(after removing the binding cloths, of course)
　　[　https://en.wikipedia.org/wiki/Foot_binding 2012-12-17　]　
　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: skin
Japanese: skin, body, surface, grain, texture, disposition, temperament, character, type
Unihan extended: skin; superficial, shallow
EDRDG: skin; body; grain; texture; disposition