التَّفَايُصُ
1.
is said to be the original and regular form of التَّفَاوُصُ, which signifies The speaking, talking, or discoursing, each to another, or each with another: the ى being changed into و because of the dammeh. (M in this article and in article فوص, and TA.)
2.
See also another explanation in article فوص: and see 4 in the present article