分手 (fēn shǒu) means “to part company; to split up; to break up”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
他们在一起三年后决定分手了。
Tāmen zàiyìqǐ sān nián hòu juédìng fēnshǒu le.
After being together for three years, they decided to break up.
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