打工(dǎ gōng) - to do casual work, to work for a wage (often away from home) in Mandarin

暑shǔ假jià我wǒ在zài饭fàn馆guǎn打dǎ工gōng。

I work in a restaurant during the summer holidays.

他tā在zài城chéng里lǐ打dǎ工gōng已yǐ经jīng五wǔ年nián了le。

He's been working in the city for five years now.

很hěn多duō大dà学xué生shēng周zhōu末mò去qù打dǎ工gōng，赚zhuàn生shēng活huó费fèi。

Lots of university students take casual jobs at weekends to earn a bit for living costs.

我wǒ还hái没méi有yǒu打dǎ工gōng的de经jīng验yàn，不bù知zhī道dào有yǒu多duō辛xīn苦kǔ。

I have no experience of casual work yet, so I do not know how hard it is.

她tā一yì边biān上shàng学xué，一yì边biān在zài咖kā啡fēi店diàn打dǎ工gōng。

She goes to school and works in a coffee shop at the same time.