An idiom describing the fluttery, nervous sensation in one's stomach when feeling anxious, excited, or romantically attracted to someone.
This phrase emerged in American English around the early 1900s, though the sensation was described differently in earlier periods. The metaphor compares the light, fluttering feeling of nervousness to the gentle movement of butterfly wings inside one's abdomen.
Before butterflies, people described this feeling as having 'rats in the stomach' or 'bats in the belfry!' The shift to butterflies reflects our changing relationship with nature - butterflies are beautiful and delicate, making nervousness seem more romantic and less disturbing than having rodents in your belly.
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