萍水相逢

strangers coming together by chance (idiom)

duckweed

surname Shui

water / river / liquid / beverage / additional charges or income / (of clothes) classifier for number of washes

aqueous solution

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 meet (by chance) / to come across

to meet by chance / to come across / (of a calendar event) to come along / (of an event) to fall on (a particular day) / to fawn upon