(swimming) A floating position in which the swimmer lies face down on the water with the arms extended forward and the legs behind them.

(programming) In JavaScript, the lines of code preceding the declaration of a variable.

(simile) Unquestionably dead.

plural of temporal dead zone

Alternative form of wouldn't be seen dead

To die, particularly in one's sleep.

plural of genetic dead end

(dialect, US) To murder someone and ensure that they are dead.

plural of parallel dead space

Synonym of alveolar dead space