Definition of 下衆の後知恵 (げすのあとぢえ)

expression
hindsight is 20-20 (even for a fool), an afterwit is everybody's wit(proverb)
Other readings:
下種の後知恵【げすのあとぢえ】
下司の後知恵【げすのあとぢえ】
げすの後知恵【げすのあとぢえ】
下種のあと知恵【げすのあとぢえ】
Related Kanji
below, down, descend, give, low, inferior
masses, great numbers, multitude, populace
behind, back, later
know, wisdom
favor, blessing, grace, kindness
species, kind, class, variety, seed
director, official, govt office, rule, administer