go astray vs go the way of the dodo

To become lost or mislaid. 

To be undesirable or unhelpful. 

To come to believe an untruth. 

To behave in an adulterous manner. 

Used other than figuratively or idiomatically: see go, astray. 

To develop bad habits; to behave improperly or illegally. 

To go extinct or become obsolete; to fall out of common practice or use; to become a thing of the past.