SINCE 1828

An Encyclopædia Britannica Company

on/as a lark

idiom

Definition of on/as a lark

US, informal

: just as a way to have fun

She entered the race on/as a lark.

Word by Word Definitions

lark play

: any of a family (Alaudidae) of chiefly Old World ground-dwelling songbirds that are usually brownish in color

: a source of or quest for amusement or adventure

: to engage in harmless fun or mischief

See the full definition of lark

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