Every decision has consequences; a person's actions will come back to them; if one starts trouble or takes actions in spite of the discontent they cause, one will incur negative consequences.

(idiomatic) alternative form of writing on the wall

(pharmacology) The range of doses of a drug which are effective without being harmful.

Illicitly, against regulations, of goods kept under the serving counter in a shop to be unobtrusively passed to a customer who knows they are available for surreptitious sale (e.g. pornographic magazines in a newsagent).

(Britain, Ireland, colloquial) In an underhand way, sneakily; unofficially, particularly with regard to payment or tax avoidance.

(colloquial, with regard to income) Undeclared for tax and social insurance etc.

Of or pertaining to theosophy.

It appears; it seems; apparently.

(Australia) A coded warning used by men to alert each other that female guests ("ducks") are present ("on the pond"), so that for politeness they should moderate their language.

Alternative form of is the Pope Catholic?