To exercise extreme caution and prudence in one's actions and words, especially to avoid problems or causing offense. To be discreet and circumspect.
他深知言多必失的道理，因此在重要的会议上总是以慎为键，不轻易发表意见。
He deeply understood the principle that too much talk leads to mistakes, so in important meetings, he always exercised extreme caution, not easily expressing his opinions.
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