Double quick and Pell-mell

Double quick adverb - At a faster speed.

Pell-mell and double quick are semantically related. in fast topic. In some cases you can use "Pell-mell" instead an adverb phrase "Double quick".

Pell-mell adverb - In a confused and reckless manner.

Double quick and pell-mell are semantically related. Sometimes you can replace phrase "Double quick" with "Pell-mell", this phrases are similar.