plural of double helix

plural of double play

A double feature. / The consecutive presentation of two episodes of a television series.

(business) To charge twice for a good or service.

plural of double bill

(baseball) A situation in which two baserunners attempt to steal a base simultaneously. This is usually called by the manager when there are runners on first base and second base.

plural of double steal

plural of double quasar

(astronomy) Two quasars that form a system, such that they gravitationally interact, or are part of the same cluster of galaxies; a binary quasar.

simple past tense and past participle of double up