Wet sand that appears firm but in which things readily sink, often found near rivers or coasts. / Anything that pulls one down or buries one metaphorically

The metal mercury. / (colloquial) An amalgam of mercury and tin applied to the backs of mirrors, quicksilvering.

Unpredictable, erratic or fickle; mercurial.

To overlay with quicksilver. / To treat with quicksilver.

(transitive) / (intransitive) / (transitive) / (intransitive) To become quicker or faster.

(transitive, rare) To apply quicksilver (mercury) to (something); to combine (something) with quicksilver; to quicksilver.

(chiefly Ireland, Northern England) In full quicken tree: the European rowan, rowan, or mountain ash (Sorbus aucuparia).

(chiefly Midlands (northern), Northern England, Northern Ireland, Scotland) Synonym of couch grass (“a species of grass, Elymus repens”); also (chiefly in the plural), the underground rhizomes of this, and sometimes other grasses.

(idiomatic, transitive) To accomplish a specified task easily and quickly. / (idiomatic, transitive) To kill a specified person easily and quickly.

Alternative spelling of quintet A composition for five voices or instruments; also, the set of five persons who sing or play five-part music.