「Fluids with wood surrounded by copulation, snared」such as occurs with service providers late in their work shift, a THICK, THICKENING atmosphere of accumulated fluids slowly drying throughout the night of PROFOUND INTENSITY that requires「washing, bathing one's snare hole, surrounded with copulation.」「Fluids flowing with woody and superfluous (a super flow of fluids)」as THICK, STICKY, INTENSE, PROFOUND, and a consequence of WORKING LATE INTO THE NIGHT (see 奴, the crotch of a female sex slave that resembles chunks of cold tōfu).
　Canines during copulation also might explain a PROFOUND and INTENSE, DEEP, EXTREME experience (究).
　A「flow」that is「more than needed or natural」for「plants, trees」might result in thick vegetation growth up to a certain point, but a water flow that is strong enough to bury「plants in a hole, trapping trees」would more than likely be a disaster of some proportion. Recall as well that most plants and trees do not grow well or for very long when planted deep within a well, or pit, or a hole, so the glyph is not likely depicting that condition.
　Some suggest elements as「flow」from「laughing cannabis herbs」referring to a「superfluous amount」of smoke「trapped within a pit hole」(蒸) to INTENSIFY it, describing a sort of purple haze that formed a DEEP, THICK atmosphere of PROFOUND INTENSITY. Related glyph indicates the original elements of「within roofed pit cavity is cannabis」(穼) to depict someone not up for a road trip in the near term. Within the caverns, and inside pit hole homes prior to the invention of window vents, the atmosphere whilst stoking herb fires would necessarily become filled with DEEP and THICK smoke, creating a PROFOUND and INTENSE experience (燥).
　Scholars explain this as water surrounding not walking legs up a tree, which refers to someone attempting to escape from some occasional heavy flooding (…?).

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: close; deep; late; profound; dark (of color, water etc)
Japanese: growing late, latening, august, beautiful, deep, profound, dense, thick, close, intense, strong, depth, profundity, deep place, silent, piercing, very deeply, to get late, to advance, to wear on, to deepen, to heighten, to intensify
Unihan extended: deep; depth; far; very, extreme
EDRDG: deep; heighten; intensify; strengthen