To betray or go back on.

Describing an experiment (usually medical) in which some information which might influence the experiment is withheld from two parties. Most commonly, parties in question are the subjects and the administrators and the information which is withheld is the treatment groups of the subjects.

(law) A clause in an insurance policy in which the insurance company agrees to pay out double the normal coverage in certain specified circumstances, most often in case of accidental death

plural of double-crosser

One who double-crosses.

A bottle of wine (usually Bordeaux) containing 3 liters of fluid, four times the volume of a standard bottle.

simple past tense and past participle of double date

present participle of double date

(informal) An ice cream cone with two scoops of ice cream. / (roller coasters) A hill that levels off for a while about halfway down.

(informal) To dip a piece of food (e.g. a chip) into a communal sauce container after already having taken a bite of the food.