prohibition, ban, forbid
禁 centers on an authoritative restriction: something is prohibited, banned, or forbidden, often with a sense of a rule or barrier.
禁 combines 林 (forest) and 示 (altar, show). The traditional explanation is that a forest near an altar was a sacred, restricted area, giving the sense of prohibition.
Two trees 林 stand over an altar 示, marking a sacred grove where entry is forbidden.
For キン, imagine a sign in the forbidden forest that says 'Keep Out' in a can: can -> キン, and the can marks the prohibition.
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prohibition; inhibition; ban
lifting a ban; raising an embargo; opening a season (hunting, fishing, etc.)
abstaining from smoking; quitting smoking
to forbid; to ban; to prohibit
confinement; imprisonment; incarceration
abstinence from alcohol; temperance
strict prohibition; ban; interdiction
thing that should be (carefully) avoided; no-no; thing to definitely not do; something forbidden; taboo
prohibition; ban; embargo
to forbid; to ban; to prohibit
detention; custody; confinement; internment
house arrest
prohibition of sale; ban on sale
No Entry; No Trespassing; No Admittance; Off Limits; Keep Out; Keep Off
imprisonment (without forced labour); incarceration; confinement
taboo word; forbidden topic
embargo
antitrust law; Antitrust Act
abstemious; austere
prohibited item; banned item
negative statute; law against something