What is the etymology for the phrase, "on a lark" or "for a lark?"
Both Wiktionary and Etymonline say that the origin of lark in the meaning "frolic, prank" is not clear. Wiktionary puts it like this:
Origin uncertain, either
- from (notably northern) English dialect lake/laik (“to play”) (c.1300, from Old Norse leika (“to play (as opposed to work)”)), with intrusive -r- common in southern British dialect; or
- shortening of skylark (1809), sailors' slang, "play roughly in the rigging of a ship", because the common European larks were proverbial for high-flying; Dutch has a similar idea in speelvogel (“playbird, a person of markedly playful nature”).
Wow, I didn't realize the issue was even in doubt. "Lark" has the sense of an impulsive, joyful, almost random flit, like the swoop of a lark. "Prank" carries a connotation of malice, of playing an unkind trick on someone -- whereas, if there's a victim, that's not a "lark". A "frolic" is energetic (to my ears) almost to the point of being laborious. As for the Dutch word -- there's a very similar word in German, spielvogel, "game-bird" but the game in this case is killing the bird! Feb 19, 2011 at 9:58
The OED's earliest citation is for the noun lark, in in Lexicon Balatronicum: a dictionary of buckish slang, university wit, and pickpocket eloquence (1811):
Lark, a piece of merriment. People playing together jocosely.
Their etymology is:
Possibly it may represent the northern lake v.1 [To exert oneself, move quickly, leap, spring; hence, to fight. Obs.], as heard by sporting men from Yorkshire jockeys or grooms; the sound /læək/ , which is written lairk in Robinson's Whitby Glossary and in dialect books, would to a southern hearer more naturally suggest ‘lark’ than ‘lake’ as its equivalent in educated pronunciation. On the other hand, it is quite as likely that the word may have originated in some allusion to lark n.1 [the bird]; compare the similar use of skylark vb., which is found a few years earlier (1809).