noun[ U ]psychologyspecializeduk/ˌæɡ.ə.rəˈfəʊ.bi.ə/us/ˌæɡ.ə.rəˈfoʊ.bi.ə/
(害怕空地、外出或远离安全之所的)恐旷症
fear of going outside and being in public places or of being in a situation from which it might be difficult to escape or in which help might not be available
Suffering from agoraphobia, she's afraid to even step outside her home.
It is estimated that approximately 500,000 adults in Great Britian suffer from agoraphobia to some extent.