Formerly included「salts, stupid, divine orifice or raised rod with sticky splats inside」(鹵, 鹹) that may explain the meanings more clearly: SALTS were used to cleanse, dry, and disinfect the flesh seam created by bending over the sole of each foot into a hairpin shape, and it requires little if any imagination to understand how this condition also applies to all the given meanings. Concubines and service providers used salts in the deep skin slits of their bound feet, a likely source of the English expression meaning to accept the bad along with the good but have some skepticism and reservations,「take it with a grain of salt.」Even only one single grain of salt remaining in the flesh seam of a no-longer-integrated foot would cause discomfort to a client, but hey, that was just par for the course which was ordered and paid for.
Note the given meaning of STINGY may refer to something that stings, such as a bite, or salt in a wound, or a puncturing penetration, or also may refer to not sharing, being cheap, miserly, niggardly. SALT initially was quite expensive and greatly valued, hence folks were STINGY with their salt (the English word 'salary' refers to being paid in salt as the currency of exchange). Biting an erection so that it bleeds from a puncturing penetration will produce the SALTY taste of blood, an action that may be undertaken by a service provider who feels cheated by five niggardly clients all engaged in puncturing penetration at the same time, in HARMONY with one another but not her.
「Wild dog erection」with「widening an orifice, aperture, passageway of the body」may have referred to a painful, STINGING or burning sensation, inserting a STINGER into flesh, stabbing with a lance or spear, or a dog spearing a bitch with his baculum at a time when the receiving orifice, if any, is unprepared to accept the penetration due to lack of natural lubricant or some other insufficiency. When applied or rubbed into an open wound, SALT causes a PAINFUL STINGING SENSATION as well.
Perhaps by the「fifth dog」in a single session, a bitch in heat may also feel a stinging sensation, as if being stung in the flesh rather than feeling much pleasure, but instinctively must continue copulating anyway due to the natural drive to reproduce the species present in all life (and, not forgetting the engorged bulbus glandis of the connected male canines). Those five SALTY DOGS of course would all likely be feeling the same way, that is, in HARMONY with one another, God, and the Universe, and this glyph may have been the source of that English expression.
Semen tastes a bit SALTY, and these elements are「erection of dog(s), array with mouth」by penetration. Note that HARMONY means 'everyone is singing the same tune' but that song may not necessarily be a happy one, especially when associated with a PAINFUL STINGING SENSATION as if rubbing salt into a wound, with everyone having the same type of infection and howling in harmony, agreement of feelings consistent with conditions.
HARMONY is a relationship characterized by a lack of conflict, and while generally today thought of as a good ideal, harmony is not necessarily the result of all good or benign influences—a harmony of evil can and does occur quite often in the world, with all participants not in conflict about a common goal or purpose. See the Similar glyphs.

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: variant of 鹹; salted; salty; stingy; miserly; all; everyone; each; widespread; harmonious
Japanese EDRDG: all, same
Unihan extended: together; all, completely; united

Used within names (nanori)
みな　･　しげ