Before revision: In most screws, applying torque to the shaft can cause itto turn, moving the shaft linearly to do work against a load , but no amount of axial load force against the shaft will cause it to turnbackwards.
After revision: In most screws, one can move the screw forward or backward by turning itand one can move the nut along the shaft by turning it, , but no amount of axial load force against the shaft will cause it to turnbackwards.