('US') She entered the race 'on/as a lark'. = ('chiefly Brit') She entered the race 'for a lark'. [=she entered the race just as a way to have fun]
All this housework 'lark' is harder than I thought!
The girls were 'larking about' in the backyard.
(..) V-, horses, -inch rims, satellite radio, Bluetooth, to in . seconds. Whoa. What do you mean, on a lark? Spur of the moment, your dad just ups and buys you a brand-new Challenger? Yeah, I barely got around the block (..)2011 TvShow: Breaking Bad Title: Problem Dog Season: 4 Episode 7