Sentence:  Mercer stammered , not <WSD>knowing</WSD> what B ' dikkat meant , and the two-nosed man answered for him , `` I think he has a nice baby head , but it is n't big enough for you to take yet '' . 
Meaning of the word marked with <WSD> tags:  be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about