Have the courtesy to do something
Definition 1 of 1
Pro Tip 1/3Expectation Violation
Use when someone doesn't meet social expectations, which can be disappointing or rude. 
He didn't have the courtesy to hold the door for the next person.
Pro Tip 2/3Express Disapproval
Often used to criticize someone's manners when you expect more polite behavior. 
You could have the courtesy to apologize when you're wrong.
Pro Tip 3/3Sarcasm Intensifier
Can add a tone of sarcasm or irony when the expected action is obviously neglected. 
Would you have the courtesy to at least pretend you're listening?
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