verb · to borrow; to lend (often in combination with 给 gěi or 出 chū)

我可以借你的钢笔吗？

verb · to make use of; to take advantage of an opportunity or situation

我想借这个机会向你道歉。

verb · by means of; with the aid of (often followed by 着 zhe)

借着灯光，他在看报纸。

noun, verb · to use something as a pretext or excuse to perform an action.

他借酒闹事，到处惹麻烦。