play along

verb

1. to cooperate (with), esp as a temporary measure

2. (tr) to manipulate as if in a game, esp for one's own advantage

   he played the widow along until she gave him her money

Idioms and Phrases

Cooperate or pretend to cooperate, as in They decided to play along with the robbers, at least for a while. [Colloquial; 1920s]