懂中文 Dong Chinese

添磚加瓦

tiān​zhuān​jiā​wǎ

fig. to do one's bit to help

Definitions

添砖加瓦 (添磚加瓦) 

tiān​zhuān​jiā​wǎ

lit. contribute bricks and tiles for a building (idiom); fig. to do one's bit to help

Sources