Double quick and Headlong

Double quick adverb - At a faster speed.

Headlong and double quick are semantically related. in fast topic. In some cases you can use "Headlong" instead the phrase "Double quick" as an adjective or an adverb, when it comes to topics like very fast.

Headlong adjective - Acting or done with excessive or careless speed.

Double quick and headlong are semantically related. Sometimes you can replace phrase "Double quick" with "Headlong", this terms are similar.