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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.
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]
1. To be on the edge or border of something: The park verges on the neighboring town.
2. To approach the nature or condition of something; come close to something: Their confidence verges on arrogance.