TO BREAK UP - [verb] to end a relationship, for example a marriage
Examples of use
Their marriage broke up after 3 years, because Jane was cheating on Tom.
He couldn't recover after she broke up with him after 4 years of being together.
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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