Sentence:  [They] deformed their children with laying one boord on the fore-head, and another in the necke ... to make them broad-faced, shauing away the haire of the crowne and necke, and letting it growe on the sides, making it curle and <WSD>bush out</WSD> to more monstrositie. 
Meaning of the word marked with <WSD> tags:  To become bushy; to grow into the form of a thick tuft.