knockbackknock‧back /ˈnɒkbæk $ ˈnɑːk-/ noun [countable] 
a refusal or rejection that you receive
a refusal or rejection that you receive- prof
- profane
- profanity
- profess
- professed
- profession
- professional
- professional foul
- Professional Golfers' Association of America
- professionalism
- professionalization
- professionalize
- professionally
- professional wrestler
- professional wrestling
- professor
- professorial
- professorially
- professorship
- proffer
- proficiency
- proficient
- proficiently
- profile
- profiling