成千上万

Traditional (Taiwan): 成千上萬

On the HSK 6 vocabulary list, at CEFR level B2.

chéngqiānshàngwàn ㄔㄥˊ ㄑㄧㄢ ㄕㄤˋ ㄨㄢˋ

    • by the thousands and tens of thousands (idiom)

      lit.

    • untold numbers innumerable countless

      fig.

Character by character

Sources