Degree of motion terminology for special aviation movements I perfectly understand yaw, pitch and roll. I'm wondering what a few special terms are for other unusual movements, such as those executed by a helicopter, drone or even perhaps something like a Harrier jump jet.

If &quot;climb&quot; refers to a straight up vertical motion along the z-axis, what is the name for the opposite? One might think fall, but I believe (keep me honest) in aviation, a &quot;fall&quot; is akin to a crash-landing type scenario, where the vehicle is out of control. Another word might be descent, but to me, that implies a downward change in pitch so that the vehicle gradually starts to lower its altitude over time and distance; instead I just want the opposite of a helicopter &quot;climb&quot;
I understand yaw means a change in left/right direction of the vehicle, but what motions describe a 90 degree, perpendicular change in motion to the left or right? Meaning, vehicle doesn't yaw, pitch or roll, it just &quot;slides&quot; 90 degrees to the left or right?

Any ideas as to what the correct terms are here?
The opposite of climb is &quot;descend&quot; (that's an easy one).
The second one can be &quot;translate&quot; or possibly &quot;slew&quot; but I think the most appropriate word is &quot;slip&quot; as in sideslip.
Translate is a controlled movement from one place to another, and slew is an uncontrolled one according to Oxford, but when you work the &quot;slew&quot; switch for a directional gyro system, it's a controlled action, so there you go.
However, those terms apply to a stationary object that starts to move sideways, &quot;slip&quot; describes lateral non-turning movement of an airplane sideways when it's already moving forward, so this is probably the best definition.