on a lark en · ADP
Meanings
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(idiomatic) In a frolicky or frivolous manner; on a whim.
When you meet the girl who wouldn't et cetera you will tell her that your are slumming, visiting your own six A.M. Lower East Side of the soul on a lark, stepping nimbly between the piles of garbage to the gay marimba rhythms in your head.
1984, Jay McInerney, Bright Lights, Big City, →ISBN, page 4: