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]

mào

old variant of 冒[mao4]

tiān

day

xià

down

zhī

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

big; large; great

no; not so

wěi

correct