冒天下之大不韪

mào tiān xià zhī dà bù wěi

see 冒大不韙|冒大不韪[mao4 da4 bu4 wei3]

冒

mào

old variant of 冒[mao4]

天

tiān

day

下

xià

down

之

zhī

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

大

dà

big; large; great

不

bù

no; not so

韪

wěi

correct