have butterflies in one's stomach

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have butterflies in one's stomach (third-person singular simple present has butterflies in one's stomach, present participle having butterflies in one's stomach, simple past and past participle had butterflies in one's stomach)

1. (intransitive) To experience a certain “fluttery” physical sensation in one's stomach, associated with nervousness, uncertainty, anxiety, apprehension, or excitement.

   Kevin had butterflies in his stomach every time he saw Chrissy.