Please define "lark" for me, as in "I did it on a lark."

Output began a bit before 8:41, and was complete before 8:43:

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"On a lark" means without much planning or reason, impulsively or unexpectedly.

Here's how it works:

"I did it on a lark." This means the person acted without a specific plan or reason. "A lark" refers to the lark bird, a small songbird known for its playful nature.

So, "on a lark" suggests something spontaneous, casual, and often with a touch of playful whimsy.

Here are some other ways to understand it:

Without much thought: The person was likely to do it quickly and without much consideration. Based on a whim: It's something they decided to do without a solid plan.

Let me know if you'd like more examples

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To me, that is pretty damn spiffy!