best behavior
definitions
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Acting in a polite, well-mannered, and socially acceptable manner, typically to make a good impression or to avoid trouble or discipline.fr: Meilleur comportement
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Conducting oneself according to the highest standards of professionalism, ethics, or excellence required by a specific role or situation.fr: Conduite exemplaire
examples
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The children were on their best behavior during the wedding ceremony.
Les enfants se sont montrés exemplaires pendant la cérémonie de mariage.
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The diplomat was expected to maintain his best behavior during the high-stakes negotiations.
On attendait du diplomate qu'il garde sa meilleure conduite lors des négociations à enjeux élevés.