To speak when it will have no effect or when the listener will not pay attention or be persuaded. To talk uselessly or pointlessly.
This expression emerged in the early 17th century, built on the ancient understanding that breath was precious life force. The metaphor suggests that speaking to someone who won't listen is literally squandering this vital essence. Shakespeare used similar breath-wasting imagery in his plays.
This phrase reveals how our ancestors viewed speech as a physical expenditure of life energy, making pointless talk not just ineffective but actually harmful to the speaker. It's fascinating that we still use this breath-based metaphor in our age of unlimited digital communication, showing how deeply rooted these physical metaphors are in human thinking.
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