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on/as a lark
Definition of on/as a lark
US, informal
: just as a way to have fun She entered the race on/as a lark.
From the M-W Editors
Word by Word Definitions
larkplay
: any of a family (Alaudidae) of chiefly Old World ground-dwelling songbirds that are usually brownish in color
: skylark — compare meadowlark
: a source of or quest for amusement or adventure
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