「Horse」with「vertical motion of penis tense with gasping a long time, or, in no-longer-integrated foot.」…the fact is that while riding at a fast pace, a horse's body bounces up and down. Horses in the wild masturbate naturally about every ninety minutes (see 馬 for details) by bouncing up and down a bit and whacking the penis up against its belly…the same action occurs while riding:
　「One last noise that horses make should be mentioned. Some geldings will make a very odd sound while trotting or cantering. This is the sound of air going into their sheath covering their penis. Stallions occasionally do this also, but it's much more common in geldings. This sound has a bearing beyond just the embarrassment of the strange sort of cross between a fart and a squeak – if you're trying to be sneaky, riding a horse who usually makes this sound would be a bad idea.」
　　[　https://www.thesurvivalistblog.net/reading-horses-body-language-squished-equine/ 2013-10-06　]　
　Nevertheless, while at a GALLOP this squeaking noise may not be heard often, but the horse's erect penis would be mightily apparent to any companion riders looking over at your horse.
　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: run fast; speed; spread; gallop
Japanese: to run, to hurry, to drive quickly, to ride fast, to win
Unihan extended: go quickly or swiftly; hurry
EDRDG: run; gallop; sail; drive (a wagon); win (fame); despatch