相輕

to hold each other in low regard

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)

light / easy / gentle / soft / reckless / unimportant / frivolous / small in number / unstressed / neutral / to disparage

scholars tend to disparage one another (idiom)