三思而行. [sān sī ér xíng]

• think thrice before acting; act with prudence; Discretion is the better part of valour.; Don't draw your bow till your arrow is fixed.; give the matter some second thoughts; Look before you leap.; Measure thrice and cut once.; Score twice before you cut once.; Think before you do anything.; think the matter over carefully before acting; Think thrice on what you do.; think twice before doing sth.; Turn three times before acting.:

  “Look before you leap” is a familiar expression.

  三思而行是一个很通俗的说法。