兩虎相爭

two tigers fighting (idiom); fierce contest between evenly matched adversaries

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 vie against one another / to fight each other / mutual aggression

to strive for / to vie for / to argue or debate / deficient or lacking (dialect) / how or what (literary)

if two tigers fight, one will get injured (idiom) / if you start a war, someone is bound to get hurt