If you don’t know what it means, the dictionary.
A. look up
B. refer to
C. point to
D. look out
网友回答
A. look up
(答案→)B. refer to
C. point to
D. look out
解析：短语辨析。look up向上看，查阅； refer to涉及，参考； point to指向；look out当心，向外看。句意：如果你不知道他的意思，参考词典。refer to指的是参阅书籍， look up是查单词(而不是字典)，故选B。