「Ground of two sides facing each other, defiant」as some sort of DEMARCATION LINE, the BORDER, the LINE ONE DOES NOT CROSS…unless believed to be prepared to win the ensuing war: how many neighboring countries have undefended borders today?「Ground」where border guards「stand speaking not walking.」Same areas where those same bored border guards with nothing to do all day, day after day, month after month, year after year, engaged each other as「feces with sounds of copulation.」
「Feces with erection and tonguing mouth copulation」is where most sane folks will DRAW THE LINE, and refuse to continue:「defiance with shit」being the MENTAL CONDITION of many escaping younger siblings as the COGNITIVE OBJECT in a STATE OF MIND considering the CIRCUMSTANCES and CONDITIONS…but when it comes to one's「array of elder brothers with erection for males」then perhaps those thoughts are「feces and the [squishy] sounds of copulation.」
…interestingly, the elements may also be drawn as「feces」and「spewed, erection standing with orifice」conjoined with「elder brother, orifice and male copulation」that may not be a mere coincidence, either. Related to the American English「Fuckin' A--」hollered as an exclamation of delight when obtaining something highly desired as a COGNITIVE OBJECT or to express complete agreement with the STATE OF MIND of a buddy, an expression used almost exclusively by males though, perhaps due to the female's (of most any species) lack of fundamental penetration wherewithal to engage physically in anal coitus from the aggressor's standpoint.
Border, limits, and boundaries relate to a line between different jurisdictions or administrative districts, zones, village sections, town quarters, all areas with a separate set of laws, rules, and regulations. Borders are normally patrolled to limit unrestricted access across the lines, with gateways and low walls around the brothel district if within a city, checkpoints, document verification and medical inspection stations enforcing quarantines if necessary. Borders encompass areas ranging in size from a country down to a small neighborhood encompassing the prostitution quarter where client thoughts and the COGNITIVE OBJECTS are「feces and the [squishy] sounds of copulation」or「land of erections in tonguing mouth copulation」and so on.「Feces with ultimate end, finish」or「sex slave copulation」describes a COGNITIVE OBJECT, as well as the end of a session, CIRCUMSTANCES or CONDITION that is so desired…making it across that ultimate BORDER but then LIMITED for doing much else until getting cleaned up a bit.
Note that in some cases, if an unruly slave successfully crossed the BORDER into a neighboring fief, the slave may not have been returned, but simply enslaved in the next fief instead:「soil, feces」and「defiant slave」with lower element of「copulation.」

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: border; place; condition; boundary; circumstances; territory
Japanese EDRDG: boundary, border, region
Unihan extended: boundary, frontier; area, region

Used within names (nanori)
さか　･　じき