Fall flat and Go wrong

Fall flat verb - Fail utterly; collapse.

Go wrong and fall flat are semantically related in fail topic. In some cases you can use "Go wrong" instead a verb phrase "Fall flat", when it comes to topics like be unsuccessful, fail to attain goal.

Go wrong verb - Be unsuccessful.

Fall flat and go wrong are semantically related in fail topic. You can use "Fall flat" instead a verb phrase "Go wrong", if it concerns topics such as go awry, be unsuccessful, fail to attain goal.