CURSE - [noun] something said that expresses anger or even hatred, or which uses swear words; a wish that with the help of magical powers something unpleasant will happen to somebody
Examples of use
He could only say curses, when his boss fired him.
The witch put a curse on him. From this moment, everything he touches turns into rock.
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English speaking practise
Remember that if you don't use that word in English conversations or writing you'll forget it in a short time. So the best thing you can do to learn this word is just trying to use it in speaking or writing. Remember also that practise is the key to fluent english speaking.
You can always find a partner, who would also like to improve his/her