Keywords: knock, knocking, door knock, rap
Sign Definition
As a Noun
                                            1.  The sound of someone hitting a door, window or wall with the knuckles of their closed fist. English = knock, knocking, door knock.
                                          
                                          
                                        As a Verb or Adjective
                                            1.  To hit a door, window or a wall several times with the knuckles of your closed fist in order to attract someone's attention. English = knock, rap.
                                          
                                          
                                         
                  
                      