A bellows uses leather attached to two flat wooden plates joined at one pivot point, co-operating (that is, operating as a team) one on top of the other, to blow air by repeatedly separating and joining them, not unlike one human astride and on top of other humans bouncing up and down a bit. Saddles were often made of leather and used to allow two bodies (the human and the cooperating horse) to ride one on top of the other while bouncing up and down (just a bit). Both meanings are analogous to humans on top of other humans cooperating while bouncing in layers and head in use, or in some fonts,「leather shafts with hand in use」on the reins, saddle, or a bellows. Saddling a horse (see 午, 馬) also as a reference to female masturbation using a two-pronged dildo, or other pestle-like smooth objects in one or both orifices resembling a queefing bellows (see 備). Horse pulling a vehicle, or more likely two horses pulling, being pulled in and out, with「vehicle」that is comprised of two「screwing, rotation」elements on each side「plugging an orifice」as the vehicle, the bellows…no doubt about all the meanings, is there? scenes that might cause quivering, and hard blowing and gasping as with a bellows, not to mention further queefing and farting.
　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)
Japanese: bellows
Unihan extended: saddle up horse; drive horse
EDRDG: bellows