lark
=something done for fun, especially something mischievous or daring;
an amusing adventure or escapade
e.g.
I only went along for a lark.
「ちょっとした好奇心でついて行った。」
語源は
early 19th cent. : perhaps from dialect lake 'play', from Old Norse leika,
「遊ぶ」という言葉が語源のようです。
