The phrase "to play along" means to go along with something or someone, often by pretending to agree or participate. It can refer to a situation where an individual is cooperating or complying with what others are doing or saying, even if they don't necessarily share the same opinion or beliefs. The phrase can also imply that the person is not being entirely honest or genuine in their actions but is instead choosing to act in accordance with the group or situation for various reasons such as avoiding conflict or maintaining social harmony.