think long and hard before (doing something)

think long and hard before (doing something)

To give very careful and thorough consideration before doing something. You're on thin ice as it is, so I would think long and hard before saying anything if I were you. The college you choose will have an enormous impact on your life, so think long and hard before making a decision. I hope she thought long and hard before taking on such a huge responsibility.

See also: and, before, hard, long, think

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