Joining the crowd is a common phrase that refers to participating in a group activity or event. The crossword solutions for this term are MINGLE (6 letters), MIX (3 letters), and MILL (4 letters). MINGLE means to socialize with others, MIX means to combine two or more things together, and MILL means to move around in a confused or disorganized way. All of these words can be used to describe joining a crowd and participating in a group activity.