"Play along" is an idiom that means to cooperate with someone's ideas or actions without necessarily agreeing with them. Some synonyms for "play along" include "go along with," "indulge," "humor," "acquiesce," "comply," "yield," "concede," "tolerate," "follow along," "act along," and "patronize." Using these phrases can help to maintain pleasant interactions with others and avoid confrontation or conflict. However, it is important to note that playing along should not be used in situations where someone is being coerced or manipulated into doing something against their will. In these cases, it is important to take a stand and assert one's boundaries.