play along

verb6

1. •
   To take part in a charade, deception, or practical joke.

   • 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 their cruel trick.
2. •
   To cooperate or go along with a plan.

   • I have doubts about your plan, but I'll play along for now.
3. •
   To participate in a joke or trick while hiding one's knowledge of its true nature.

   • I knew that my blind date was an April Fools trick, but I played along anyway.
4. •
   To pretend to cooperate or go along with a plan.

   • I haven't told him yet, I'm still playing along with his scheme.
5. •
   To play a musical instrument in synchrony with a playback of a recording.

   • I like to practise guitar by playing along with records.
6. •
   (UK) To manipulate (someone).

   • The con man plays his victims along until he senses the moment to ask for money.