Idioms: throw caution to the winds

자료: The American Heritage® Dictionary of Idioms,  http://www.answers.com/caution%20to%20the%20winds

Idioms:  throw caution to the winds

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Also, throw discretion to the winds. Behave or speak very rashly, as in:

• Throwing caution to the winds, he ran after the truck, or 
• I'm afraid she's thrown discretion to the winds and told everyone about the divorce. 

This expression uses to the winds in the sense of "utterly vanishing" or "out of existence," a usage dating from the mid-1600s. The first recorded use of throw to the winds was in 1885.