Monday–morning quarterback noun
plural ∼ -backs [count] US, disapproving : a person who unfairly criticizes or questions the decisions and actions of other people after something has happened
▪ After the water main broke, the Monday-morning quarterbacks [=second-guessers] in the media criticized the city for not replacing the old pipes.
▪ After the water main broke, the Monday-morning quarterbacks [=second-guessers] in the media criticized the city for not replacing the old pipes.
