rolling stock, railroad cars, wheeled vehicles

pair, the two, both persons...

parents, both parents

both hands

both, both sides, both parties

double-sided wait (for one's last tile), wait for either of two different tiles to complete a chow which will finish one's hand

tael (Chinese unit of weight and currency)

both sides

both countries, Ryōgoku (area of Tokyo)

both (political) parties

both houses of parliament, both upper and lower house

both persons

both days, two days

compatibility, coexistence, standing together

change, money exchange

both ends, either end, both edges...

both ends, either end, both edges...

both arguments, both opinions

both feet, both legs

both banks (of a river)

both armies, both teams, both sides

two wheels

both arms

both wings, both flanks

both extremities, North and South Poles, positive and negative poles

two great men

both eyes

both families

both sexes

two ways, both ways, two kinds