(chemistry) A solid solution of two simple salts, often in a definite proportion

A bet of the same value as the initial one, resulting in either a doubling of a loss, or it being cancelled.

To experience double vision, wherein the eyes do not focus on the same point and a single object is therefore perceived as two.

(nautical) A light, narrow rowing boat, especially one used in competitive rowing, in which two rowers each have two oars / (rowing, especially in plural) A race in which such craft participate

A poem whose stanzas, except the first two, are clues for words. The initial letters of these words, in order, form a word clued by the first stanza; the final letters, the second stanza.

A colloid in which an emulsion is suspended either in a third liquid, or in a second instance of the inner liquid e.g. water in oil in water

A dilemma in which someone receives contradictory instructions and cannot act on either.

(sports) A pair of games played one after another between the same teams. / A pair of sporting events, one after the other, at a single venue.

plural of double-whammy

A large pan containing hot water, into which other smaller pans are set in order to cook food at low heat (below the boiling point) or to keep food warm.