pack it in
/pˈak ɪt ˈɪn/
/pˈæk ɪɾ ˈɪn/
Etymology
English
This informal phrase grows out of the ordinary verb "pack" in the idea of closing something up and going away. From that picture, "pack it in" came to mean giving up the task in front of you and stopping, either for the day or for good. The word "it" does not point to a specific thing here; it is simply part of the fixed expression.