1. noun
A type of question or phrase with one or more words replaced with a blank line, giving the reader the chance to add the missing word(s).
Example:
2. verb
a) To answer]] or complete
The Zionists intended to shape the perceptions of a global public with limited interest in or understanding of the issues, filling in the blanks with their own narrative.
b) Verb|complete a fill in the blank.
Wikipedia foundation.