Correct

等而下之

/ děng ér xià zhī / 
Strokes

Definition

going from there to lower grades (idiom)

Example

Definition

lower down from that grade down

1
Míngpái
名牌
chǎnpǐn
产品
de
的
zhìliàng
质量
shàngqiě
尚且
rúcǐ
如此
  
,
děngérxiàzhī
等而下之
de
的
zápái
杂牌
huò
货
jiù
就
kěxiǎngérzhī
可想而知
liǎo
了
  
。

Even the quality of famous-brand/brand-name products leave much to be desired, let alone that of inferior brands.