One suggestion of all these elements together is that the glyph refers to a shrewd shaman proprietress instructing all her service providers to use all sorts of delaying tactics in order to keep the clients in the establishment longer, which also served to heighten the experience of orgasm once it was finally achieved. Gradually increasing the level of frustration for each client caused the climax to ultimately become much more satisfying.
　Old form of related glyph 暗. Frankly,「sound within gateway」to brothels or anywhere else, does not begin to relate to the given meanings of: to KEEP CLOSED, SHUT OUT, to cause DARKNESS, being HIDDEN, in SHADE, covered as in working a COVERT activity, MUDDLED speaking, IGNORANT as in ignoring the obvious, STUPID in a STUPOR with one's mouth open and jaw slack, cause the OBSCURING of flashing bright light (i.e., an eclipse. See 食 'to eat' covering something with one's mouth and the euphemism of 'flashing,' flash a smile, and so on).
　Means IGNORANT STUPID, and literally DUMB: a 'dumb' person is not necessarily ignorant nor stupid—the person simply is unable to speak. So how did dumb and stupid become associated in English? perhaps due to this glyph and its meaning carried back from China by the British opium peddlers: the penalty and warning to other for biting fellation was mangling of the tongue, causing dumbness—being aware of this, yet persisting as a biter, was considered ignorant (ignoring the punishment warning?)…furthermore, COVERTLY working as a fellatrix or hiring such a literally dumb, speechless person so branded as one's fellatrix was also ignorant (ignoring the bite warning?). Needless to point out perhaps is that anyone with a bar of metal twisted through her tongue may be forced to keep her mouth open, slack-jawed, appearing as if in a stupor all the time, that is, STUPID.
　「Sounds emanating from within the gateway to the prostitution quarter」might account for all the listed meanings if used in reference to the feelings of workers discussed among themselves, of which it was wise to play dumb and be dumb (no speech) by not complaining to the shaman proprietress or before clients.
　Inner elements are「swollen penis and mouth tonguing」referring to the fellatio type of sex trade, but the sex trade was neither hidden nor illegal in dynastic China, nor were blow jobs…however, it was believed imperative to warn everyone and to punish anyone who bites whilst fellating. Defiant, unruly sex slaves were punished by piercing the tongue and then inserting a twisted bar through the hole, or tearing out the tongue with large pincers, naturally causing a speech impediment that was used to brand the individual for life as a biting fellatrix and warn possible clients from then on simply by a cursory examination of her mouth.
　Inner element as「screams, hollering noise sounds」that a client would make as the jaw clenched, and during the procedure to rearrange the offending tongue. Such a slave might need to engage in SECRET, SHADY, ILLEGAL, BLACK MARKET businesses to stay alive, being SHUT OUT of the gateway to the brothels. DESPAIR, HOPELESSNESS for both the damaged service provider and the damaged client, with the need to keep one's condition HIDDEN, SECRET, CONCEALED.

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: to close; to eclipse; muddled; stupid; ignorant; variant of 暗
Japanese: darkness, the dark, bewilderment, despair, hopelessness, black-marketeering, shady, illegal, under-the-table, gloomy, dull, depressed, dispirited, sorrowful, bitter, unclear, unfamiliar, unknown, without one's knowledge, easily
Unihan extended: close, shut; dark, dismal
EDRDG: get dark; gloom; disorder