فطن

3 مُفَاطَنَةٌ ذ is of the measure مُفَاعَلَةٌ from فَطِنَ: (S:) [as such it signifies The contending, or vying, one with another, in intelligence, understanding, knowledge, sagacity, or skill; whence فَاطَنْتُهُ is used in the K (in art. حجو) as a syn. of حَاجَيْتُهُ, q. v.: or] it signifies [sometimes] the showing intelligence, understanding, knowledge, sagacity, or skill, one with another. (PS.) [Agreeably with the former explanation,] one says, فَاطَنَهُ فِى الكَلَامِ i. e. He held a dialogue or colloquy, or a disputation or debate, with him [ with the view of trying which of them would prove superior in intelligence, &c.]; syn. رَاجَعَهُ. (K) [See also 3 in art. لحن.]