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Related to learned: learnt
learn (something) down pat
To learn, master, or understand something perfectly, to the point of requiring little or no focus to do, recall, or accomplish it. I made sure to learn my speech down pat before the ceremony so I wouldn't spend the whole time looking down at piece of paper. My sister is such a musical prodigy that she can learn a song down pat after listening to it only once or twice.
learn (one's) lesson
To learn through painful experience not to do something, often something one had been warned about or knew might be risky. I told you that you'd feel awful if you drank that much wine. I hope you've learned your lesson. I certainly learned my lesson about buying something from a stranger online.
learn (something) the hard way
To learn or discover something through personal experience, especially that which is difficult, painful, or unpleasant. Starting your own business is really tough. I had to learn that the hard way. Everyone will tell you that becoming a parent is challenging, but you never really know what that means until you learn about it the hard way.