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1. To play the same song as someone else on one's own instrument. I sang while my uncle played along on the banjo.
2. To cooperate with someone or pretend to do so; to support or agree with something that someone is doing or saying, especially as part of a joke, lie, or scam. Hey, I'm going to play a prank on Jimbo when he comes in. Just play along! I know that school can be boring sometimes, but you just need to play along for a while until college, where you can study things that really interest you.
play along(with someone or something)
1. Lit. to play a musical instrument with someone or a group. The trombonist sat down and began to play along with the others. Do you mind if I play along?
2. Fig. to pretend to cooperate with someone or something in a joke, scam, etc. I decided that I would play along with Larry for a while and see what would happen. I don't think I want to play along.
Cooperate or pretend to cooperate, as in They decided to play along with the robbers, at least for a while. [Colloquial; 1920s]
1. To cooperate or pretend to cooperate with someone: We decided to play along with their silly plans for a while. If you don't play along, we'll never get the job done.
2. To accompany someone or something by playing a musical instrument: I listen to the radio and play along with the songs on my guitar.