The fear of things that are in clusters. For example: holes or dots in clusters, certain insects gathered or on top of each other in a group, groupings of things
"Omg! Ew! I cannot look at that, it freaks me out! I have clusterphobia!"
(n) The fear of going into any type of business meeting because it always turns into a total cluster-fuck.
Wes experienced severe clusterphobia whenever his work group called a meeting because every plan they came up with always turned into a pathetic cluster-fuck.
To have a sense of cabin fever while living in a concentrated housing development often called cluster townhouses in South Africa. These cluster townhouses can be seen on the outskirts of major city centres where space is abundant and these units often promise "security" in return for living space.
Dude1: "Dude I can't do this anymore, this clusterphobia is killing me"
Dude2: "Best you get out into the country and enjoy the open space then"