十有八九

shíyǒubājiǔ ㄕˊ ㄧㄡˇ ㄅㄚ ㄐㄧㄡˇ

    • most likely
    • mostly (in 8 or 9 cases out of 10)
    • vast majority

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
ten have eight or nine
Meaning
Most likely; in the great majority of cases. 'Nine times out of ten'.

Sources