1
general::
Phrase(s): verge (up)on something
to be almost identical to something; to be similar to or almost the same as something. (Upon is formal and less commonly used than on.) • Your actions verge upon mutiny. • What you said verges on an insult.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
1. Approach, come close to, as in Her ability verges on genius. [Early 1800s] 2. Be on the edge or border of, as in Our property verges on conservation land. [Late 1700s]
American Heritage Idioms