Some suggest「flow, many」「sheep」perhaps as whitecaps on waves resembling fleece on hills, and a very large herd of sheep flowing over the hills in waves might resemble the ocean. Yet, there are no very large lakes in China, so few whitecapped waves if any, other than oceanside, and ancient Chinese culture developed along two large rivers, not the ocean. Meanings of VAST and BOUNDLESS could certainly apply to the OCEAN for those folks living near the seashore who could see and understand both the SEA, and, a flock of sheep running in the hills.
　Formerly in Chinese, a reference to a SILVERY, GLINTING color, such as might be seen reflecting off the surface of the OCEAN perhaps some of the time…or, might be seen reflecting off the skin surface of a「flow on a sheep」in a spot where there was no fleece or the hairs were worn away by constant friction. In that regard,「flow of fluid with sheep」may refer to the ubiquitous use of sheep as alternatives to human-like mates, and the resulting copious flows likened to an OCEAN of it…VAST, knowing no bounds. Any sheep rancher and most rural boys can tell you that, while variations do exist, a preponderance of sheep vaginal labia appear greyish, hence when wet or covered with a「flow of fluids」of various sorts, the result is a SILVERY GLINT. Same is true for asses and mules.
　Meaning THE WEST, or foreign, is a modern reference to European and American cultures beyond the sea and not a compass direction, but may also be a reference to other Western proclivities of「flowing with sheep」:
　「In the 1960s, a team of researchers compared incarcerated males, convicted male sex offenders, and a control group of non-incarcerated males on various measures. The overall finding was that, among the 2,715 people studied, 17.7 percent of the sex offenders, 14.7 percent of the prison inmates, and 8 percent [one in 12.5 people] of the control group reported having committed sex acts with animals.」
　　[　https://jaapl.org/content/early/2019/05/16/JAAPL.003836-19 2021-10-31].
　「In domesticity [that is, humans raising animals], there is a tremendous amount of sex with animals. You talk to people from village societies and pastoral societies even today and they say, 'Oh, yeah, sure.' The boys have intercourse with donkeys, occasionally intercourse with sheep. It's not uncommon. It's not even particularly shameful.」
　　[　quoted link https://www.fathom.com/feature/35184/index.html is now-dead, so see https://www.news24.com/life/archive/Bestiality-is-much-much-more-common-than-you-think-20150218 2023-05-17　]　
　「Fluid flowing like sheep」with the appearance of SILVERY GLINT, and a VAST AMOUNT OF FLUID: during ovulation of a female human and estrus of other animals such as sheep, the individual can become more sexually aroused than at any other time. Adding a dildo and/or an actual penis with enthusiastic action acts just like a kitchen whisk with frothy white discharges whipped up and resembling egg white meringue, mousse, cotton tufts and tassels, or sheep wool, and when observed causes great excitement. Froth is pumped out spurting from the vaginal orifice about once per second as the muscles contract and release during successive waves of orgasm, forming what appears to be a silvery beard below a quivering「mouth, orifice」
　「As a woman's cycle progresses, the mucus secreted from the cervix will change due to hormonal fluctuations. A woman is considered to be ovulating and fertile when the mucus is clear, stretchy and slippery, and looks like egg whites.」
　　[　https://ic.steadyhealth.com/most-fertile-cervical-mucus 2017-05-03　]　See 羏 for further details.

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: ocean; vast; foreign; silver dollar or coin
Japanese: open sea, Occident and Orient, ocean, foreign, Western, European
Unihan extended: ocean, sea; foreign; western
EDRDG: ocean; western style

Used within names (nanori)
なだ　･　ひろ　･　ひろし　･　よ　･　よし