on the double meaning

[American idiom]
very fast. (Informal.)
• Okay, you guys. Get over here on the double.
• Get yourself into this house on the double.

[American slang]
very fast; twice as fast as normal. (Originally military. Alludes to "double time" in marching.)
   Get over here right now—on the double!
  She wants to see you in her office on the double.

Examples

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1. her clothes spread out on the double bed.
2. on the double function of quot; mad lady quot; in jane eyre
3. on the double subjective structure of literature and art
4. study on the double sounding forms of shen-ze dialect
5. fire engines came on the double when the house was on fire