effective spot; pressure point
Rare term for an effective spot, especially in acupuncture or massage. Also used metaphorically for a key point.
In acupuncture, it is important to accurately locate the effective spots.
Rare metaphorical use for the crux or important point of a problem or matter.
Unless you identify the key point of the problem, it is difficult to solve.
Compound of 利き (kiki, 'effective') and 所 (tokoro/dokoro, 'place'). The exact historical derivation is uncertain, but the term is rare in modern Japanese.