TO SUE SB - [verb] to present a legal claim against somebody because you have suffered or lost something
Examples of use
If you don't leave my daughter alone, I'll sue you for disturbing our peace.
James sued his own son for stealing the money.
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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