To be in perfect harmony or close agreement, often describing the deep mutual understanding and responsiveness between friends or partners, like the ancient Chinese instruments xun and chi playing together.
这对搭档在工作中总是配合默契，一个提出想法，另一个立刻就能心领神会地给予支持，真正做到了如埙如篪。
This pair of partners always works in perfect harmony; one proposes an idea, and the other can immediately understand and provide support, truly achieving a state of mutual responsiveness and cooperation like the xun and chi.
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