「Thread in winter」suggested by some to depict that silk caterpillars can no longer be harvested, but unfortunately the actual natural life cycle of the silkmoth does not fit this description:
　「The eggs, which require cold weather to trigger development, hatch anywhere from six weeks to 12 months after being deposited. The eggs hatch producing grubs that develop into larvae (the caterpillars or silkworms) and spend several weeks munching on mulberry leaves and molting. When they outgrow their skin, [they simply] squeeze out [of] it, jaw and all, and grow a new one. After tossing off their skin for the [fourth] time they begin [to] find a place and [begin] making their cocoon. After about a month they emerge as moths.」
　　[　https://factsanddetails.com/china/cat9/sub63/item342.html 2023-05-18　]　Mulberry trees do not produce leaves during winter, the only food that silkmoth caterpillars will eat. Some suggest that the「threads of winter」vaguely implies the end of the natural annual growth cycle for most outdoor organisms and everything restarts next spring, yet nowhere near all organisms follow this cycle, as plenty of plants, animals, microbes, fungi, and so forth continue living just fine through the winter months, fortunately for human beings and all other life on the planet.
　As CONCLUSION, FINISH, THE END, to have DONE COMPLETELY by the time the「ejaculation has cooled.」…see 螽 that depicts the animal with proportionally the largest testes known on our planet.「Ejaculation」with「testicles, spread feet and two inside crotch with head」suggesting that a client's business has CONCLUDED, FINISHED.「Ejaculation with spread feet, two physical states」indicates to FINISH, to DO SOMETHING COMPLETELY as in the case of turgid and flaccid.
　The foot-dis-integrating process occurred during winter so that the cold stone floor might provide some numbing relief. Much more likely are these elements as the「threads of winter」as a reference to the tight binding cloths on newly no-longer-integrated feet, demarking the COMPLETION, FINISH of the natural growth cycle as a normal human and the beginning of the metamorphosis into a divine being as a service-providing sex slave:.
　Foot binding was:「…the custom of applying painfully tight binding to the feet of young girls to prevent further growth. …The process was started before the arch of the foot had a chance to develop fully, usually between the ages of 2 and 5. …Binding usually started during the winter months since the feet were more likely to be numb, and therefore the pain would not be as extreme. …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　]　
　「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　]　

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: end; finish
Japanese: the end, final, end of life, death, never, not at all, close, finish, termination, ending, quitting, closing, indicates disappointment for not having done what one wanted or intended to do, to finish, to stop, to end, to put an end to, to bring to a close, to close, to close down, to shut down, to shut up, to put away, to put back, to keep, to store, to finish …, to do … completely, finally, at last, to graduate, demise
Unihan extended: end; finally, in the end
EDRDG: end; finish

Used within names (nanori)
ばて