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1. Literally, to play the same song as someone else on one's own instrument. I sang while my uncle played along on the banjo.
2. By extension, to cooperate with someone or pretend to do so; to support or agree with something someone is doing or saying, especially as part of a joke, lie, or scam. If you play along, we could convince the IRS that the money came from donations. Just play along and do what they say, and nobody will get hurt!
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.