Answer: crenelate

AnswerCrossword Clue
CRENELATEFurnish with battlements.
CRENELATEFortify with battlements.
CRENELATEFurnish with battlements, as a castle
crenelateto furnish with crenels or battlements
crenelate(US) to provide with battlements also CRENELLATE
crenelatefurnished with crenelations, as a parapet or molding, in the manner of a battlement