CINNABAR is a pasty, gooey compound of mercury and sulfur found naturally in three basic tints: bright bloody red crimson, reddish-brown, and reddish-orange (yellow material, such as pus, mixed with red creates an orange tint).「Emissions of/with one's herd meat asset, chattel」during the heyday of the harem-age of dynastic China, likely occurring with/to a newly-acquired harem member prior to her age of commencing menstruation at adolescence, i.e., still a prepubescent virgin but sold to the fief lord for his deflowering, resulting in an emission of her blood, and feces perhaps, with his jism—hence, the color triumvirate of the lord's stump and the girl's crotch becoming SCARLET, the CRIMSON tide, smeared with REDDISH-BROWN PASTE, and so on.
Obviously,「head, dammed flow, sliding of a woody rod」with anything alive but「immature」might easily become BLOODIED, especially if the chosen orifice is still a bit too small to physically stretch sufficiently in order to permit entry of a thickly girthed woody stump, leaving torn hymenal tissue tags, ripped anal sphincters, and/or a ruptured perineum in its wake. Note that these same elements sadly can apply to a very young lamb,「head in ewe」as well as to a human meat asset (妹). These same pasty, reddish-brown, smeared conditions might result also due to a simple lack of care in applying some proactive lubricant prior to penetration, perhaps due to the carelessness of an overzealous owner when breaking in a new arrival, primate or ovine.
「Prostrate with woody」describes the same conditions as mentioned above, or, someone who is quite ill, and oozing BLOODY pasty discharges while unable to become erect, unable to stand. Wood with the main trunk (本) dammed, internally scarred, or just plain severed.
Unlikely, but a「person prostrate」with a「tree」lying on top suggests that the tree fell upon and crushed the lumberjack who was engaged in cutting down the tree, who is now a squashed BLOODY PASTE, a greasy spot on the forest floor, maggot viands.

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: cinnabar; see 硃砂|朱砂; vermilion
Japanese EDRDG: vermilion, cinnabar, scarlet, red, bloody
Unihan extended: cinnabar, vermilion

Used within names (nanori)
あ　･　あか　･　あき　･　す