一唱一和

to echo one another (idiom)

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

to sing / to call loudly / to chant

old variant of 和[he2]

to compose a poem in reply (to sb's poem) using the same rhyme sequence / to join in the singing / to chime in with others

to complete a set in mahjong or playing cards

to combine a powdery substance (flour, plaster etc) with water / Taiwan pr. [huo4]

to mix (ingredients) together / to blend / classifier for rinses of clothes / classifier for boilings of medicinal herbs

old variant of 和[he2] / harmonious

(joining two nouns) and; together with; with (Taiwan pr. [han4]) / (math.) sum / to make peace / (sports) to draw; to tie / (bound form) harmonious / (bound form) Japan; Japanese