- 内线交易 nèixiànjiāoyì insider tradingIllegal stock market trading by company directors, shareholders, or staff who use private information for personal profit
- 走内线 zǒunèixiàn to use insider contactsTo pull strings or seek favor with someone in power through their family members or close associates, often for dishonest or underhanded purposes.
- 内线消息 nèixiànxiāoxi insider informationprivate or internal information about an organization that is not available to the public
- 国内线 guónèixiàn domestic linedomestic flight or internal transportation route, including air, train, or ferry services