A system of insulated windows (and doors) having two parallel layers of glass separated by an air space

plural of double agent

plural of double-wide

(US) A trailer measuring twenty feet or more in width and ninety feet or less in length, towed as a two separate units before assembly; especially, a mobile home that is twice its standard width.

The double time, a marching cadence (pace) approaching running speed.

(intransitive) To double-time, march (or rather run) at the above speedy pace.

Very quickly; at once; on the double.

Third-person singular simple present indicative form of double-end

present participle of double-end

(rail transport) a system of operating trains with a driver at each end of the train for a fast turnaround time.