Dig up and Hit upon

Dig up verb - To come upon after searching, study, or effort.

Hit upon and dig up are semantically related in discover topic. In some cases you can use "Hit upon" instead a verb "Dig up", when it comes to topics like reveal, find, lay hands on, discover or be discovered.

Hit upon verb - To come upon unexpectedly or by chance.

Dig up and hit upon are semantically related in discover topic. Sometimes you can use "Dig up" instead a verb "Hit upon", if it concerns topics such as reveal, find, lay hands on, discover or be discovered.