bore to the northwest是什么意思?为什么用bear?

问题描述:

bore to the northwest是什么意思?为什么用bear?
As soon as they left his high hedges at the east of his fenced lands they turned north and then bore to the northwest.出自霍比特人.如题.

bear是born原型
前面用的都是过去时所以这里也用born
born to在xx生存、繁衍(差不多就这个意思)