「Bone meat of fleshpot lacking peace and calm」who cannot bear to stay and tries to escape (a bad investment, wasted resources): punishment reserved for twice-escaped and twice-recaptured slaves who「stayed only temporarily and then departed」as do「visitors and guests.」Punishment reserved for those visitors as guests who were unable to pay their account with the proprietress,「bone meat of deliberately out-of-reach one」or「one in-house under the roof」with 「insufficient funds」and as a consequence the ex-client's knees were crushed with a heavy blunt instrument as settlement of the bad debt. Perhaps source of the English term DEADBEAT.
　Hobbling both runaway slaves and deceitful clients was a highly effective method of identification within the community, but especially assisted bouncers at the door of any business establishment to prevent re-entry of an unwanted visitor. Deadbeats and twice-recaptured slaves would then be compelled to move about only with the use of his or her arms while dragging the lower portion of the body forward along the ground, resembling a mudskipper (a species of fish that can perambulate on land for a while but leaves a telltale track in its wake). While not too good for maintaining the condition of the skin or any clothing worn on one's lower body, it did encourage shoulder and arm muscle development at the expense of thickly-calloused hand palms, eventually, assuming the individual survived that long. Suggested as the original intent and source of the English contractual law term「without recourse」since a person so hobbled could no longer move themselves in reverse, nor return to the brothel for admittance (subsequently, the legal definition evolved somewhat).

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: kneecapping; to cut or smash the kneecaps as corporal punishment
Unihan extended: kneecap
EDRDG: kneecap