最基础的意思就是“转向某处、朝向某处”.
比如：Turn to the left and you will find the post.
根据语境不同,还有其他含义,比如turn to sb/sth,是向某人求助的意思,
I had to turn to the dictionary for help.
我只得求助于字典了.
还有“转身跟某人说话的意思”.其实都是其本意的延伸.