Oldest elements were「array of penis in cavity days」or「sprouting day」(旾) or「prick taut with cavity having two sets of lips」(舂). These elements seem to be「taut pricks day, or, tonguing mouth」or「taut bush days」(春) as the time for SEX, with many species engaging in oral stimulation of genitals prior to copulation (not a trait solely of human beings, it turns out). SPRING is the time of estrus, or rutting, for many animals, and has long symbolized sexual pairing and represents copulation unlimited,「the days for unleashing pricks」or「(stroking, or) many erection days.」Note that human females generally no longer exhibit overt signs of estrus, although ovulation is often detectable, as is the lordosis behavior of primates, felines and other species, as well as booty shaking, twerking of humans.
　「Animal sexual behaviour takes many different forms, even within the same species. Researchers have observed monogamy, promiscuity, sex between species, sexual arousal from objects or places, sex apparently via duress or coercion, copulation with dead animals [necrophilia], homosexual, heterosexual and bisexual sexual behaviour, and situational sexual behaviour and a range of other practices among animals other than humans. Related studies have noted diversity in sexed bodies and gendered behaviour, such as intersex and transgender animals. The study of animal sexuality (and primate sexuality especially) is a rapidly developing field. It used to be believed that only humans and a handful of species performed sexual acts other than for procreation, and that animals' sexuality was instinctive and a simple response to the 'right' stimulation (sight, scent). Current understanding is that many species that were formerly believed monogamous have now been proven to be promiscuous or opportunistic in nature. A wide range of species appear both to masturbate and to use objects as tools to help them do so. In many species animals try to give and get sexual stimulation with others where procreation is not the aim. And homosexual behaviour has now been observed among 1,500 species and in 500 of those it is well documented.」
　　[　https://www.monkeyland.co.za/index.php?comp=article&op=view&id=588 2017-07-08　]　
　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: spring (time); gay; joyful; youthful; love; lust; life
Japanese: spring, springtime, New Year, prime, adolescence, puberty, sexuality, to become spring-like, to show signs of spring
Unihan extended: spring; wanton
EDRDG: springtime; spring (season)

Used within names (nanori)
あずま　･　かす　･　すの　･　ひ　･　わら