Monday morning quarterback
noun/ˌmʌndeɪ ˌmɔːnɪŋ ˈkwɔːtəbæk/, /ˌmʌndi ˌmɔːnɪŋ ˈkwɔːtəbæk/
/ˌmʌndeɪ ˌmɔːrnɪŋ ˈkwɔːrtərbæk/, /ˌmʌndi ˌmɔːrnɪŋ ˈkwɔːrtərbæk/
(North American English, informal, disapproving)- a person who criticizes or comments on an event after it has happenedWord OriginThe quarterback directs the play in an American football match and matches are usually played at the weekend.
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Monday morning quarterback