十九 (shíjiǔ): nineteen

Meanings

Tā jīnnián shíjiǔ suì.

She is nineteen years old this year.

Bān shàng yǒu shíjiǔ ge xuéshēng.

There are nineteen students in the class.

usage

十有八九 (shíyǒubājiǔ, 'eight or nine out of ten') is a common idiom meaning 'most likely' or 'in all probability.'

十 shí

九 jiǔ