hind·sight 
/ˈhaɪndˌsaɪt/ noun
/ˈhaɪndˌsaɪt/ noun [noncount] : the knowledge and understanding that you have about an event only after it has happened
▪ It's easy for us to say that the war was wrong, but we have the advantage/benefit of hindsight. ▪ In hindsight, it's clear that there were alternatives. = With hindsight, we clearly see that there were alternatives. — see also twenty-twenty hindsight at twenty-twenty
▪ It's easy for us to say that the war was wrong, but we have the advantage/benefit of hindsight. ▪ In hindsight, it's clear that there were alternatives. = With hindsight, we clearly see that there were alternatives. — see also twenty-twenty hindsight at twenty-twenty
