verb/akastiˈʝaɾ/
to house, house in a castle, keep in a castle; to castellate, incastellate, to make into a castle, to build in the form of a castle or to add battlements to an existing building; to take the form of a castle
“En esta época cada familia se acastillaba en sus casas y aun en los templos (como ya he referido en otros lugares de esta obra) ó cuyo fin fabricaban estas torres, y las guarnecian de armas.” — At this time, each family was housed in their homes and even in the temples (as I have already mentioned elsewhere in this work) or for whose purpose these towers were manufactured, and they were equipped with weapons.
From a- + castillo + -ar.