Scholars and dictionaries explain that these elements are「metal for cutting sheaves while holding two in your hand」that is, a SICKLE, SCYTHE, slingblade. Cutting two sheaves at once perhaps indicates TRICKY, CLEVER, but such an action by a serf does not seem overly clever or tricky, in reality, and is so simple that even most city folks could do this by the third or fourth attempt (assuming no self-inflicted injuries had yet occurred). Formerly the「cavern」element enclosed「two concurrently in hand」(鐮) but inside a cavern is not a normal location to find growing sheaves of grain being harvested…
　Elements meaning「metal」are「person taking stance with downward thrusting motions」with the right element「hand with two thrusting, harvesting multiple shafts concurrently.」Perhaps some sexual service providers were normally「unable」to perform this action with「two in hand, concurrently」hence the original meaning of TRICKY, CLEVER and the extended meaning became SCYTHE as「metal harvesting multiple shafts concurrently」after that tool was invented. NOISINESS may refer to a single service provider doing three, five, or even possibly seven or eight clients at once (using all her ports simultaneously) as a large harvest of seeds…at least, we can easily believe this was attempted in dynastic China, since they seem to have tried most everything imaginable. Harvesting grains stalks with a sickle is not inherently noisy unless one loses a finger in the process.
　Refers to the part of a fish directly behind the gills, since a「person thrusting in stance with grasping two concurrently」may have two fingers, one on each side, inserted in a fish's lower gills in order to carry it or hold it up for viewing.
　GOOSENECK suggests grabbing the neck of some sort of shaft in a two-handed grip, and then doing with that neck whatever was the intent.

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: variant of 鐮|镰
Japanese: sickle, sickle-and-chain, spear with curved cross-blades, gooseneck tenon and mortise joint, noisiness, part of a fish around the gills
Unihan extended: sickle
EDRDG: sickle; scythe; trick

Used within names (nanori)
かた　･　かね