Definition of "play along"

play along

verb
third-person singular simple present plays along, present participle playing along, simple past and past participle played along
1. Used other than figuratively or idiomatically: see play,‎ along.
2. (idiomatic) To take part in a charade, deception, or practical joke.
  Quotations
  North Korea loves to spring surprises. More unusual is for its US foe to play along.
  29 February 2012, Aidan Foster-Carter, BBC News North Korea: The denuclearisation dance resumes