Double-quick and Double quick

Double-quick adverb - With great speed.

Double quick and double-quick are semantically related In some cases you can replace phrase "Double quick" with "Double-quick", this phrases are similar.

Double quick adverb - At a faster speed.

Double-quick and double quick are semantically related in fast topic. You can use "Double-quick" instead the phrase "Double quick" as a noun or an adjective or an adverb or a verb, if it concerns topics such as very fast, with great speed, quick marching pace.