Tenn. R. Civ. P. 50.01
A motion for a directed verdict may be made at the close of the evidence offered by an opposing party or at the close of the case. The court shall reserve ruling until all parties alleging fault against any other party have presented their respective proof-in-chief. A party who moves for a directed verdict at the close of the evidence offered by an opponent may offer evidence in the event that the motion is not granted, without having reserved the right so to do and to the same extent as if the motion had not been made. A motion for a directed verdict which is not granted is not a waiver of trial by jury even though all parties to the action have moved for directed verdicts. The order of the court granting a motion for a directed verdict is effective without any assent of the jury.
Tenn. R. Civ. P. 50.01