At a breakneck pace and Lickety split

Lickety split and at a breakneck pace are semantically related. In some cases you can replace phrase "Lickety split" with "At a breakneck pace", this phrases are similar.

Lickety split adverb - Without delay.

At a breakneck pace and lickety split are semantically related. You can use "At a breakneck pace" instead an adverb phrase "Lickety split".