兩虎相鬥

two tigers fight (idiom); fig. a dispute between two powerful adversaries / a battle of the giants

two / both / some / a few / tael, unit of weight equal to 50 grams (modern) or 1⁄16 of a catty 斤[jin1] (old)

tiger / CL:隻|只[zhi1]

each other / one another / mutually / fret on the neck of a pipa 琵琶[pi2 pa5] (a fret on the soundboard is called a 品[pin3])

appearance / portrait / picture / government minister / (physics) phase / (literary) to appraise (esp. by scrutinizing physical features) / to read sb's fortune (by physiognomy, palmistry etc)

to fight / to struggle / to condemn / to censure / to contend / to put together / coming together

when two tigers fight, one will get injured (idiom) / if it comes to a fight, someone will get hurt.