To be in collusion or secret communication; to be in league with each other; to be on the same wavelength, especially in subtle or covert ways.
市场上的几家大公司声气相通，价格变动总是同步进行，这让小商家很难生存。
The several large companies in the market seem to be in tacit understanding, as price changes always happen simultaneously, making it difficult for smaller businesses to survive.
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