颠倒是非 is a four-character idiom meaning 'to deliberately confuse right and wrong' — it describes someone who twists facts or misrepresents the truth, often for selfish or malicious reasons. The word 颠倒 means 'to turn upside down' and 是非 means 'right and wrong', so the literal image is 'turning right and wrong upside down'. You can use it as a verb phrase (object after it) or as a modifier (颠倒是非的话). It's a fixed expression; the syllables are not separated in use.