滑天下之大稽

huá tiān xià zhī dà jī

to be the most ridiculous thing in the world (idiom)

滑

huá

to slip; to slide

天

tiān

day

下

xià

down

之

zhī

(possessive particle, literary equivalent of 的[de5])

大

dà

big; large; great

稽

jī

to inspect