Plain English Meaning

The whole tail surface tilts a little when you trim, instead of just a small tab on it. This takes the pressure off the controls so you do not have to keep pushing or pulling on the yoke to hold the nose where you want it.

Full Definition

A horizontal stabilizer at the tail of an aircraft whose angle of incidence can be changed in flight to trim the aircraft for a desired pitch attitude without holding continuous control pressure on the elevator. The pilot adjusts it through a trim wheel or switch, which repositions the entire stabilizer surface so the on the elevator is neutralized at the chosen and .