"Yi chang yi he" (one sings and the other joins in) originally referred to one person singing and another responding, originating from the line "Uncle, elder brother, I will lead and you shall respond" in the "Zheng Feng: Tuo Xi" section of the Book of Songs, and later evolved into a set phrase. Its deeper meaning describes two people or two parties echoing each other and cooperating in tacit agreement, often carrying a derogatory sense, referring to backing each other up, flattering, or chiming in for a common purpose, especially used to criticize unprincipled mutual support. It is mostly used in scenarios describing conversations, performances, or political and social occasions where one party speaks and the other immediately echoes. In terms of cultural background, it reflects traditional Chinese culture's emphasis on "harmony," but in this idiom, "harmony" is given a negative connotation, implying a lack of independent judgment. Its emotional tone is generally negative, often containing sarcasm and criticism, referring to two parties colluding and singing the same tune. Occasionally it can also be neutral or positive, describing close coordination, but in modern Chinese it is mostly used in a derogatory sense.
📝 Example
1. The two of them always sing the same tune and chime in with each other at meetings, turning what should be a simple topic into something incredibly complicated. (Referring to two people coordinating and echoing each other, with a derogatory connotation.)
2. On stage, crosstalk performers must echo and support each other in perfect coordination to deliver their punchlines with great effect. (Referring to mutual echoing and seamless cooperation, with a neutral to mildly positive connotation.)