TO SPOIL - [verb] to make something being worse; to treat somebody too well
Examples of use
We were having a great time during the party, until he came and spoilt everything.
Stop buying your children everything they want! You'll spoil them.
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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