1rhinoceros horn, reputed to confer telepathic powers
2fig. mutual sensitivity
3tacit exchange of romantic feelings
4a meeting of minds
Example
tā他hé和wǒ我jiǎn zhí简直xīn心yǒu有líng xī灵犀，cái才gāng刚shuō说yí jù一句，lìng另yì fāng一方yǐ jīng已经huí yìng回应。
他和我简直心有灵犀，才刚说一句，另一方已经回应。
He and I have a near-telepathic understanding of each other. No sooner does one of us say something than the other is already responding.