Traditionally, this meant that the speaker was assuming that which was to be proved; it now is used to mean raises the question, or the following question is begging to be asked. Example: The fact that Jack recently has been spending so much time with Jill begs the question: Is he in love with her?
BEGS THE QUESTION
Meaning of BEGS THE QUESTION in English
Slang English vocab. Английский сленговый словарь. 2012