I have taken some mixed martial arts but I never could get a clear description on what staying plum is or plum

I tried the internet but there is no info on it. Anyone know or have a link so I can study it's technique.

I have taken some mixed martial arts but I never could get a clear description on what staying plum is or plum
Staying "Plumb" is staying "Square" or to staying 90 degrees to the ground.



The expression stems from using a "plum bob" in construction to assure that the structure is square to the surface.
Reply:The only time I've heard the word 'plum' in MMA is the "thai plum." It's another term for the Muay Thai clinch.



That's basically when you put both hands around the back of your opponent's head, and pull it into your chest. Don't interlace your fingers. Squeeze your elbows together, step back in a semi-circle, and let the knees fly!



For more info, search for 'Thai Clinch' or 'Muay Thai Clinch.'



EDIT: the guy above me has a better answer. It seems to fit the context better... I've never heard that before, though. I wonder where that terminology comes from.
Reply:The first answerer has it except for the spelling. It is plumb, not plum. Plum is a fruit. Plumb revers to being vertical, not leaning in any direction.
Reply:the term is "aplomb"
Reply:I have never really heard it put that way before. At least not in relation to any martial art moves. In construction ( typically carpentry ) something that is straight up and down is considered plum. You can find a Plum bob in any hardware store. It is usually pointed on one end and kind of heavy. you tie a string to it and hang it from a fixed point so that the string in nice and straight, and the plum bob is setting on its tip not leaning to one side or the other. so maybe who ever is using this term is telling you you need to correct your posture and not lean forward or to one side or the other while doing what ever techniques it is you are practicing.