noun
a basic ability to perceive, understand, and judge things that is shared by nearly all people
adjective
having good sense or sound judgment
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Common sense dictates that we should always look both ways before crossing the street.
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It's just common sense to bring an umbrella when it's raining.
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Using common sense, we knew not to trust that shady character.
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In the game of chess, having good common sense can help you anticipate your opponent's moves.