dà xiǎo
这双鞋我穿上大小正合适。
zhè shuāng xié wǒ chuān shàng dàxiǎo zhèng héshì
These shoes fit me perfectly in size.
不分大小
bù fēn dàxiǎo
Regardless of size/importance; without distinction
没大小。
méi dàxiǎo
No sense of propriety/respect; disrespectful