on/as a lark

idiom

US, informal
: just as a way to have fun
She entered the race on/as a lark.

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“On/as a lark.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%2Fas%20a%20lark. Accessed 3 Oct. 2022.

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