verb
to consider carefully before making a decision
adverb
to do something with caution or hesitation
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Before making a decision, it is wise to think twice and consider all possible outcomes.
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If I were you, I would definitely think twice before agreeing to that deal.
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Dude, you better think twice before messing with him, he's not someone to mess with.
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When it comes to matters of the heart, sometimes it's best to think twice before letting your emotions take over.