Exciting, moving, or emotionally powerful; or the present participle of 'stir' meaning to mix or agitate a liquid.
From Old English 'styrian' meaning 'to agitate or move.' The word originally referred to physical movement and evolved to include emotional and inspirational senses.
A 'stirring' speech and 'stirring a pot' use the same word because both create movement and change—one moves people emotionally, one moves liquid physically, showing how metaphors help us understand big emotions through small actions.
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