If someone behaves properly, they behave in a way that is considered acceptable and not rude. He's a spoilt brat and it's about time he learnt to behave properly. They will be concerned to do.
Understanding the Context
Definition of properly adverb in oxford advanced learner's dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. There are eight meanings listed in oed's entry for the adverb properly, four of which are labelled obsolete. See 'meaning & use' for definitions, usage, and quotation evidence.
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Key Insights
Define properly. Properly synonyms, properly pronunciation, properly translation, english dictionary definition of properly. Characterized by appropriateness or suitability; Correctly, or in a satisfactory way: In a socially and morally acceptable way: Learn more. The meaning of properly is in a proper manner. How to use properly in a sentence.
Final Thoughts
In a way that is acceptable or suitable; In a way that is accurate or correct