Play Along Meaning

(idiomatic) To take part in a charade, deception, or practical joke

Example:   James thought it was cruel for the fraternity members to make the pledge think his father had died suddenly and refused to play along.
  James played along with the frat boys.
  James played along with their cruel trick.
29 February 2012, Aidan Foster-Carter, BBC News North Korea: The denuclearisation dance resumes[1]
  North Korea loves to spring surprises. More unusual is for its US foe to play along.