Meaning of shǒu:
首
head; chief
Tā shì zhège xiàngmù de fùzérén, suàndéshàng shì lǐngdǎo de dì èr bǎ shǒu.
他是这个项目的负责人,算得上是领导的第二把手。
He is responsible for this project and can be considered the head's right-hand man.
Tā shì gōngsī de dì yī wèi nǚ shǒu xí zhí xíng guān.
她是公司的第一位女首席执行官。
She is the first female chief executive officer of the company.
first (occasion, thing etc)
Zhè shì wǒ shǒu cì lái Zhōngguó.
这是我首次来中国。
This is my first time coming to China.
classifier for poems, songs etc
Tā xiě le yī shǒu shī.
他写了一首诗。
He wrote a poem.